1961757381 has 32 divisors (see below), whose sum is σ = 2850277248. Its totient is φ = 1195304960.

The previous prime is 1961757361. The next prime is 1961757419. The reversal of 1961757381 is 1837571691.

1961757381 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1961757381 - 2¹⁴ = 1961740997 is a prime.

It is a super-2 number, since 2×1961757381² = 7696984043815958322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1961757381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961757311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472591 + ... + 476723.

It is an arithmetic number, because the mean of its divisors is an integer number (89071164).

Almost surely, 2^1961757381 is an apocalyptic number.

It is an amenable number.

1961757381 is a deficient number, since it is larger than the sum of its proper divisors (888519867).

1961757381 is a wasteful number, since it uses less digits than its factorization.

1961757381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421.

The product of its digits is 317520, while the sum is 48.

The square root of 1961757381 is about 44291.7303906723. The cubic root of 1961757381 is about 1251.8388681380.

The spelling of 1961757381 in words is "one billion, nine hundred sixty-one million, seven hundred fifty-seven thousand, three hundred eighty-one".