85970431 has 4 divisors (see below), whose sum is σ = 86485392. Its totient is φ = 85455472.

The previous prime is 85970419. The next prime is 85970461. The reversal of 85970431 is 13407958.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85970431 is a prime.

It is a super-2 number, since 2×85970431² = 14781830012651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85970461) 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, 257230 + ... + 257563.

It is an arithmetic number, because the mean of its divisors is an integer number (21621348).

Almost surely, 2^85970431 is an apocalyptic number.

85970431 is a deficient number, since it is larger than the sum of its proper divisors (514961).

85970431 is a wasteful number, since it uses less digits than its factorization.

85970431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514960.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 85970431 is about 9272.0241048004. The cubic root of 85970431 is about 441.3499021845.

The spelling of 85970431 in words is "eighty-five million, nine hundred seventy thousand, four hundred thirty-one".