85691961 has 6 divisors (see below), whose sum is σ = 123777290. Its totient is φ = 57127968.

The previous prime is 85691911. The next prime is 85692017. The reversal of 85691961 is 16919658.

It can be written as a sum of positive squares in only one way, i.e., 44475561 + 41216400 = 6669^2 + 6420^2 .

It is not a de Polignac number, because 85691961 - 2¹¹ = 85689913 is a prime.

It is a super-2 number, since 2×85691961² = 14686224360051042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85691911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4760656 + ... + 4760673.

Almost surely, 2^85691961 is an apocalyptic number.

It is an amenable number.

85691961 is a deficient number, since it is larger than the sum of its proper divisors (38085329).

85691961 is a wasteful number, since it uses less digits than its factorization.

85691961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9521335 (or 9521332 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 85691961 is about 9256.9952468390. The cubic root of 85691961 is about 440.8728558144.

The spelling of 85691961 in words is "eighty-five million, six hundred ninety-one thousand, nine hundred sixty-one".