1915272261521 has 2 divisors, whose sum is σ = 1915272261522. Its totient is φ = 1915272261520.

The previous prime is 1915272261509. The next prime is 1915272261571. The reversal of 1915272261521 is 1251622725191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1156786291600 + 758485969921 = 1075540^2 + 870911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915272261521 - 2³⁰ = 1914198519697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1915272261571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957636130760 + 957636130761.

It is an arithmetic number, because the mean of its divisors is an integer number (957636130761).

Almost surely, 2^{1915272261521} is an apocalyptic number.

It is an amenable number.

1915272261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915272261521 is an equidigital number, since it uses as much as digits as its factorization.

1915272261521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 44.

The spelling of 1915272261521 in words is "one trillion, nine hundred fifteen billion, two hundred seventy-two million, two hundred sixty-one thousand, five hundred twenty-one".