131377517 has 2 divisors, whose sum is σ = 131377518. Its totient is φ = 131377516.

The previous prime is 131377501. The next prime is 131377523. The reversal of 131377517 is 715773131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123232201 + 8145316 = 11101^2 + 2854^2 .

It is an emirp because it is prime and its reverse (715773131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131377517 - 2⁴ = 131377501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131377567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65688758 + 65688759.

It is an arithmetic number, because the mean of its divisors is an integer number (65688759).

Almost surely, 2^131377517 is an apocalyptic number.

It is an amenable number.

131377517 is a deficient number, since it is larger than the sum of its proper divisors (1).

131377517 is an equidigital number, since it uses as much as digits as its factorization.

131377517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15435, while the sum is 35.

The square root of 131377517 is about 11462.0031844351. The cubic root of 131377517 is about 508.3627064875.

The spelling of 131377517 in words is "one hundred thirty-one million, three hundred seventy-seven thousand, five hundred seventeen".