131517517 has 4 divisors (see below), whose sum is σ = 132553216. Its totient is φ = 130481820.

The previous prime is 131517481. The next prime is 131517553. The reversal of 131517517 is 715715131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (131517481) and next prime (131517553).

It is a cyclic number.

It is not a de Polignac number, because 131517517 - 2¹¹ = 131515469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131517577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517659 + ... + 517912.

It is an arithmetic number, because the mean of its divisors is an integer number (33138304).

Almost surely, 2^131517517 is an apocalyptic number.

It is an amenable number.

131517517 is a deficient number, since it is larger than the sum of its proper divisors (1035699).

131517517 is a wasteful number, since it uses less digits than its factorization.

131517517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035698.

The product of its digits is 3675, while the sum is 31.

The square root of 131517517 is about 11468.1086932414. The cubic root of 131517517 is about 508.5432181277.

The spelling of 131517517 in words is "one hundred thirty-one million, five hundred seventeen thousand, five hundred seventeen".