15313121261 has 2 divisors, whose sum is σ = 15313121262. Its totient is φ = 15313121260.

The previous prime is 15313121233. The next prime is 15313121333. The reversal of 15313121261 is 16212131351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15205356100 + 107765161 = 123310^2 + 10381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15313121261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15313121261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15313121561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7656560630 + 7656560631.

It is an arithmetic number, because the mean of its divisors is an integer number (7656560631).

Almost surely, 2^15313121261 is an apocalyptic number.

It is an amenable number.

15313121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15313121261 is an equidigital number, since it uses as much as digits as its factorization.

15313121261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The spelling of 15313121261 in words is "fifteen billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred sixty-one".