911213431 has 4 divisors (see below), whose sum is σ = 911313664. Its totient is φ = 911113200.

The previous prime is 911213377. The next prime is 911213461. The reversal of 911213431 is 134312119.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 134312119 = 31 ⋅4332649.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-911213431 is a prime.

It is a super-2 number, since 2×911213431² = 1660619833669583522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 911213396 and 911213405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (911213461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34950 + ... + 55171.

It is an arithmetic number, because the mean of its divisors is an integer number (227828416).

Almost surely, 2^911213431 is an apocalyptic number.

911213431 is the 19092-nd centered pentagonal number.

911213431 is a deficient number, since it is larger than the sum of its proper divisors (100233).

911213431 is a wasteful number, since it uses less digits than its factorization.

911213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100232.

The product of its digits is 648, while the sum is 25.

The square root of 911213431 is about 30186.3119807637. The cubic root of 911213431 is about 969.4826415306.

The spelling of 911213431 in words is "nine hundred eleven million, two hundred thirteen thousand, four hundred thirty-one".