85547431 has 2 divisors, whose sum is σ = 85547432. Its totient is φ = 85547430.

The previous prime is 85547401. The next prime is 85547461. The reversal of 85547431 is 13474558.

It is a balanced prime because it is at equal distance from previous prime (85547401) and next prime (85547461).

It is a cyclic number.

It is not a de Polignac number, because 85547431 - 2¹³ = 85539239 is a prime.

It is a super-2 number, since 2×85547431² = 14636725901399522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85547401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42773715 + 42773716.

It is an arithmetic number, because the mean of its divisors is an integer number (42773716).

Almost surely, 2^85547431 is an apocalyptic number.

85547431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85547431 is an equidigital number, since it uses as much as digits as its factorization.

85547431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 37.

The square root of 85547431 is about 9249.1854235927. The cubic root of 85547431 is about 440.6248542896.

The spelling of 85547431 in words is "eighty-five million, five hundred forty-seven thousand, four hundred thirty-one".