238645531 has 2 divisors, whose sum is σ = 238645532. Its totient is φ = 238645530.

The previous prime is 238645513. The next prime is 238645549. The reversal of 238645531 is 135546832.

Together with previous prime (238645513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (238645513) and next prime (238645549).

It is a cyclic number.

It is not a de Polignac number, because 238645531 - 2⁹ = 238645019 is a prime.

It is a super-2 number, since 2×238645531² = 113903378932543922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (238645331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119322765 + 119322766.

It is an arithmetic number, because the mean of its divisors is an integer number (119322766).

Almost surely, 2^238645531 is an apocalyptic number.

238645531 is a deficient number, since it is larger than the sum of its proper divisors (1).

238645531 is an equidigital number, since it uses as much as digits as its factorization.

238645531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 37.

The square root of 238645531 is about 15448.1562330266. The cubic root of 238645531 is about 620.2752255340.

The spelling of 238645531 in words is "two hundred thirty-eight million, six hundred forty-five thousand, five hundred thirty-one".