511191961 has 24 divisors (see below), whose sum is σ = 619211520. Its totient is φ = 420269472.

The previous prime is 511191931. The next prime is 511191973. The reversal of 511191961 is 169191115.

It is not a de Polignac number, because 511191961 - 2⁵ = 511191929 is a prime.

It is a super-2 number, since 2×511191961² = 522634441982051042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (511191931) 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, 230520 + ... + 232726.

It is an arithmetic number, because the mean of its divisors is an integer number (25800480).

Almost surely, 2^511191961 is an apocalyptic number.

It is an amenable number.

511191961 is a deficient number, since it is larger than the sum of its proper divisors (108019559).

511191961 is a wasteful number, since it uses less digits than its factorization.

511191961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413 (or 2406 counting only the distinct ones).

The product of its digits is 2430, while the sum is 34.

The square root of 511191961 is about 22609.5546395766. The cubic root of 511191961 is about 799.5789247626.

The spelling of 511191961 in words is "five hundred eleven million, one hundred ninety-one thousand, nine hundred sixty-one".