65238431 has 2 divisors, whose sum is σ = 65238432. Its totient is φ = 65238430.

The previous prime is 65238409. The next prime is 65238443. The reversal of 65238431 is 13483256.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65238431 is a prime.

It is a super-4 number, since 4×65238431⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65238461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32619215 + 32619216.

It is an arithmetic number, because the mean of its divisors is an integer number (32619216).

Almost surely, 2^65238431 is an apocalyptic number.

65238431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65238431 is an equidigital number, since it uses as much as digits as its factorization.

65238431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 65238431 is about 8077.0310758347. The cubic root of 65238431 is about 402.5635993787.

The spelling of 65238431 in words is "sixty-five million, two hundred thirty-eight thousand, four hundred thirty-one".