131015553450521 has 2 divisors, whose sum is σ = 131015553450522. Its totient is φ = 131015553450520.

The previous prime is 131015553450517. The next prime is 131015553450599. The reversal of 131015553450521 is 125054355510131.

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., 124233070788121 + 6782482662400 = 11145989^2 + 2604320^2 .

It is a cyclic number.

It is not a de Polignac number, because 131015553450521 - 2² = 131015553450517 is a prime.

It is not a weakly prime, because it can be changed into another prime (131015553650521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65507776725260 + 65507776725261.

It is an arithmetic number, because the mean of its divisors is an integer number (65507776725261).

Almost surely, 2^{131015553450521} is an apocalyptic number.

It is an amenable number.

131015553450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

131015553450521 is an equidigital number, since it uses as much as digits as its factorization.

131015553450521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 131015553450521 in words is "one hundred thirty-one trillion, fifteen billion, five hundred fifty-three million, four hundred fifty thousand, five hundred twenty-one".