15311233525381 has 2 divisors, whose sum is σ = 15311233525382. Its totient is φ = 15311233525380.

The previous prime is 15311233525361. The next prime is 15311233525403. The reversal of 15311233525381 is 18352533211351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15311052488356 + 181037025 = 3912934^2 + 13455^2 .

It is a cyclic number.

It is not a de Polignac number, because 15311233525381 - 2¹⁵ = 15311233492613 is a prime.

It is a super-2 number, since 2×15311233525381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15311233525361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7655616762690 + 7655616762691.

It is an arithmetic number, because the mean of its divisors is an integer number (7655616762691).

Almost surely, 2^{15311233525381} is an apocalyptic number.

It is an amenable number.

15311233525381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15311233525381 is an equidigital number, since it uses as much as digits as its factorization.

15311233525381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 43.

The spelling of 15311233525381 in words is "fifteen trillion, three hundred eleven billion, two hundred thirty-three million, five hundred twenty-five thousand, three hundred eighty-one".