131521202321557 has 2 divisors, whose sum is σ = 131521202321558. Its totient is φ = 131521202321556.

The previous prime is 131521202321533. The next prime is 131521202321563. The reversal of 131521202321557 is 755123202125131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112129165879236 + 19392036442321 = 10589106^2 + 4403639^2 .

It is a cyclic number.

It is not a de Polignac number, because 131521202321557 - 2²⁷ = 131521068103829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131521202321507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65760601160778 + 65760601160779.

It is an arithmetic number, because the mean of its divisors is an integer number (65760601160779).

Almost surely, 2^{131521202321557} is an apocalyptic number.

It is an amenable number.

131521202321557 is a deficient number, since it is larger than the sum of its proper divisors (1).

131521202321557 is an equidigital number, since it uses as much as digits as its factorization.

131521202321557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 40.

Adding to 131521202321557 its reverse (755123202125131), we get a palindrome (886644404446688).

The spelling of 131521202321557 in words is "one hundred thirty-one trillion, five hundred twenty-one billion, two hundred two million, three hundred twenty-one thousand, five hundred fifty-seven".