85257143 has 2 divisors, whose sum is σ = 85257144. Its totient is φ = 85257142.

The previous prime is 85257121. The next prime is 85257149. The reversal of 85257143 is 34175258.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85257143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85257149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42628571 + 42628572.

It is an arithmetic number, because the mean of its divisors is an integer number (42628572).

Almost surely, 2^85257143 is an apocalyptic number.

85257143 is a deficient number, since it is larger than the sum of its proper divisors (1).

85257143 is an equidigital number, since it uses as much as digits as its factorization.

85257143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 85257143 is about 9233.4794633442. The cubic root of 85257143 is about 440.1258988900.

The spelling of 85257143 in words is "eighty-five million, two hundred fifty-seven thousand, one hundred forty-three".