1961791524 has 72 divisors (see below), whose sum is σ = 6182624448. Its totient is φ = 509555520.

The previous prime is 1961791519. The next prime is 1961791543. The reversal of 1961791524 is 4251971691.

1961791524 is a `hidden beast` number, since 1 + 9 + 617 + 9 + 1 + 5 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1961791524.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351087 + ... + 356630.

It is an arithmetic number, because the mean of its divisors is an integer number (85869784).

Almost surely, 2^1961791524 is an apocalyptic number.

1961791524 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1961791524 is an abundant number, since it is smaller than the sum of its proper divisors (4220832924).

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

1961791524 is a wasteful number, since it uses less digits than its factorization.

1961791524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707745 (or 707740 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1961791524 is about 44292.1158221190. The cubic root of 1961791524 is about 1251.8461305526.

The spelling of 1961791524 in words is "one billion, nine hundred sixty-one million, seven hundred ninety-one thousand, five hundred twenty-four".