291223472 has 10 divisors (see below), whose sum is σ = 564245508. Its totient is φ = 145611728.

The previous prime is 291223463. The next prime is 291223483. The reversal of 291223472 is 274322192.

It is a super-2 number, since 2×291223472² = 169622221287469568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100718 + ... + 9100749.

Almost surely, 2^291223472 is an apocalyptic number.

It is an amenable number.

291223472 is a deficient number, since it is larger than the sum of its proper divisors (273022036).

291223472 is a wasteful number, since it uses less digits than its factorization.

291223472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18201475 (or 18201469 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 291223472 is about 17065.2709325109. The cubic root of 291223472 is about 662.8401268564.

The spelling of 291223472 in words is "two hundred ninety-one million, two hundred twenty-three thousand, four hundred seventy-two".