85751531 has 2 divisors, whose sum is σ = 85751532. Its totient is φ = 85751530.

The previous prime is 85751507. The next prime is 85751591. The reversal of 85751531 is 13515758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85751531 - 2⁶ = 85751467 is a prime.

It is a super-2 number, since 2×85751531² = 14706650137687922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85751491 and 85751500.

It is not a weakly prime, because it can be changed into another prime (85751591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42875765 + 42875766.

It is an arithmetic number, because the mean of its divisors is an integer number (42875766).

Almost surely, 2^85751531 is an apocalyptic number.

85751531 is a deficient number, since it is larger than the sum of its proper divisors (1).

85751531 is an equidigital number, since it uses as much as digits as its factorization.

85751531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 35.

The square root of 85751531 is about 9260.2122545868. The cubic root of 85751531 is about 440.9749918546.

The spelling of 85751531 in words is "eighty-five million, seven hundred fifty-one thousand, five hundred thirty-one".