85344431 has 2 divisors, whose sum is σ = 85344432. Its totient is φ = 85344430.

The previous prime is 85344397. The next prime is 85344439. The reversal of 85344431 is 13444358.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85344431 - 2²² = 81150127 is a prime.

It is a super-2 number, since 2×85344431² = 14567343805427522, 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 (85344439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42672215 + 42672216.

It is an arithmetic number, because the mean of its divisors is an integer number (42672216).

Almost surely, 2^85344431 is an apocalyptic number.

85344431 is a deficient number, since it is larger than the sum of its proper divisors (1).

85344431 is an equidigital number, since it uses as much as digits as its factorization.

85344431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 32.

The square root of 85344431 is about 9238.2049663341. The cubic root of 85344431 is about 440.2760509461.

Adding to 85344431 its reverse (13444358), we get a palindrome (98788789).

The spelling of 85344431 in words is "eighty-five million, three hundred forty-four thousand, four hundred thirty-one".