1961797579 has 8 divisors (see below), whose sum is σ = 2242703840. Its totient is φ = 1681053696.

The previous prime is 1961797567. The next prime is 1961797589. The reversal of 1961797579 is 9757971691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1961797579 - 2⁷ = 1961797451 is a prime.

It is a super-2 number, since 2×1961797579² = 7697299481940522482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961797559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13494 + ... + 64075.

It is an arithmetic number, because the mean of its divisors is an integer number (280337980).

Almost surely, 2^1961797579 is an apocalyptic number.

1961797579 is a deficient number, since it is larger than the sum of its proper divisors (280906261).

1961797579 is an equidigital number, since it uses as much as digits as its factorization.

1961797579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81189.

The product of its digits is 7501410, while the sum is 61.

The square root of 1961797579 is about 44292.1841750889. The cubic root of 1961797579 is about 1251.8474184775.

The spelling of 1961797579 in words is "one billion, nine hundred sixty-one million, seven hundred ninety-seven thousand, five hundred seventy-nine".