38131231 has 2 divisors, whose sum is σ = 38131232. Its totient is φ = 38131230.

The previous prime is 38131229. The next prime is 38131253. The reversal of 38131231 is 13213183.

It is an a-pointer prime, because the next prime (38131253) can be obtained adding 38131231 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38131231 - 2¹ = 38131229 is a prime.

It is a super-2 number, since 2×38131231² = 2907981555150722, which contains 22 as substring.

Together with 38131229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38131211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19065615 + 19065616.

It is an arithmetic number, because the mean of its divisors is an integer number (19065616).

Almost surely, 2^38131231 is an apocalyptic number.

38131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

38131231 is an equidigital number, since it uses as much as digits as its factorization.

38131231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 38131231 is about 6175.0490686310. The cubic root of 38131231 is about 336.5841095265.

The spelling of 38131231 in words is "thirty-eight million, one hundred thirty-one thousand, two hundred thirty-one".