1961490258 has 192 divisors, whose sum is σ = 5414153472. Its totient is φ = 499530240.

The previous prime is 1961490247. The next prime is 1961490281. The reversal of 1961490258 is 8520941691.

1961490258 is a `hidden beast` number, since 1 + 9 + 614 + 9 + 0 + 25 + 8 = 666.

It is a Curzon 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 95 ways as a sum of consecutive naturals, for example, 6694360 + ... + 6694652.

It is an arithmetic number, because the mean of its divisors is an integer number (28198716).

Almost surely, 2^1961490258 is an apocalyptic number.

1961490258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961490258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2707076736).

1961490258 is an abundant number, since it is smaller than the sum of its proper divisors (3452663214).

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

1961490258 is a wasteful number, since it uses less digits than its factorization.

1961490258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1961490258 is about 44288.7147928228. The cubic root of 1961490258 is about 1251.7820466139.

The spelling of 1961490258 in words is "one billion, nine hundred sixty-one million, four hundred ninety thousand, two hundred fifty-eight".