517691961 has 12 divisors (see below), whose sum is σ = 748970560. Its totient is φ = 344577240.

The previous prime is 517691959. The next prime is 517692023. The reversal of 517691961 is 169196715.

517691961 is a `hidden beast` number, since 517 + 69 + 19 + 61 = 666.

It is not a de Polignac number, because 517691961 - 2¹ = 517691959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517691261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39901 + ... + 51258.

Almost surely, 2^517691961 is an apocalyptic number.

It is an amenable number.

517691961 is a deficient number, since it is larger than the sum of its proper divisors (231278599).

517691961 is a wasteful number, since it uses less digits than its factorization.

517691961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91796 (or 91793 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 517691961 is about 22752.8451187978. The cubic root of 517691961 is about 802.9536445798.

The spelling of 517691961 in words is "five hundred seventeen million, six hundred ninety-one thousand, nine hundred sixty-one".