531238690 has 16 divisors (see below), whose sum is σ = 961958592. Its totient is φ = 211222384.

The previous prime is 531238657. The next prime is 531238717. The reversal of 531238690 is 96832135.

It is a super-2 number, since 2×531238690² = 564429091505832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157384 + ... + 160723.

It is an arithmetic number, because the mean of its divisors is an integer number (60122412).

Almost surely, 2^531238690 is an apocalyptic number.

531238690 is a deficient number, since it is larger than the sum of its proper divisors (430719902).

531238690 is a wasteful number, since it uses less digits than its factorization.

531238690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318281.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 531238690 is about 23048.6157935786. The cubic root of 531238690 is about 809.8972028261.

The spelling of 531238690 in words is "five hundred thirty-one million, two hundred thirty-eight thousand, six hundred ninety".