1961335900 has 72 divisors (see below), whose sum is σ = 4651952256. Its totient is φ = 714547200.

The previous prime is 1961335891. The next prime is 1961335903. The reversal of 1961335900 is 95331691.

It is a self number, because there is not a number n which added to its sum of digits gives 1961335900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961335903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34092 + ... + 71308.

It is an arithmetic number, because the mean of its divisors is an integer number (64610448).

Almost surely, 2^1961335900 is an apocalyptic number.

1961335900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961335900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2325976128).

1961335900 is an abundant number, since it is smaller than the sum of its proper divisors (2690616356).

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

1961335900 is a wasteful number, since it uses less digits than its factorization.

1961335900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37279 (or 37272 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 1961335900 is about 44286.9721249940. The cubic root of 1961335900 is about 1251.7492097371.

The spelling of 1961335900 in words is "one billion, nine hundred sixty-one million, three hundred thirty-five thousand, nine hundred".