1961495550 has 288 divisors, whose sum is σ = 6351022080. Its totient is φ = 424569600.

The previous prime is 1961495537. The next prime is 1961495573. The reversal of 1961495550 is 555941691.

It is a happy number.

1961495550 is a `hidden beast` number, since 1 + 9 + 6 + 1 + 4 + 95 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1961495496 and 1961495505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5175261 + ... + 5175639.

It is an arithmetic number, because the mean of its divisors is an integer number (22052160).

Almost surely, 2^1961495550 is an apocalyptic number.

1961495550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961495550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3175511040).

1961495550 is an abundant number, since it is smaller than the sum of its proper divisors (4389526530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1961495550 is a wasteful number, since it uses less digits than its factorization.

1961495550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The square root of 1961495550 is about 44288.7745371217. The cubic root of 1961495550 is about 1251.7831723608.

The spelling of 1961495550 in words is "one billion, nine hundred sixty-one million, four hundred ninety-five thousand, five hundred fifty".