85439251 has 2 divisors, whose sum is σ = 85439252. Its totient is φ = 85439250.

The previous prime is 85439239. The next prime is 85439281. The reversal of 85439251 is 15293458.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85439251 - 2⁹ = 85438739 is a prime.

It is a super-2 number, since 2×85439251² = 14599731222882002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85439251.

It is not a weakly prime, because it can be changed into another prime (85439231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719625 + 42719626.

It is an arithmetic number, because the mean of its divisors is an integer number (42719626).

Almost surely, 2^85439251 is an apocalyptic number.

85439251 is a deficient number, since it is larger than the sum of its proper divisors (1).

85439251 is an equidigital number, since it uses as much as digits as its factorization.

85439251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 85439251 is about 9243.3354910443. The cubic root of 85439251 is about 440.4390435145.

The spelling of 85439251 in words is "eighty-five million, four hundred thirty-nine thousand, two hundred fifty-one".