15213038111861 has 2 divisors, whose sum is σ = 15213038111862. Its totient is φ = 15213038111860.

The previous prime is 15213038111737. The next prime is 15213038111879. The reversal of 15213038111861 is 16811183031251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13930764971236 + 1282273140625 = 3732394^2 + 1132375^2 .

It is a cyclic number.

It is not a de Polignac number, because 15213038111861 - 2¹⁴ = 15213038095477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15213038111261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7606519055930 + 7606519055931.

It is an arithmetic number, because the mean of its divisors is an integer number (7606519055931).

Almost surely, 2^{15213038111861} is an apocalyptic number.

It is an amenable number.

15213038111861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15213038111861 is an equidigital number, since it uses as much as digits as its factorization.

15213038111861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 15213038111861 in words is "fifteen trillion, two hundred thirteen billion, thirty-eight million, one hundred eleven thousand, eight hundred sixty-one".