85557397 has 2 divisors, whose sum is σ = 85557398. Its totient is φ = 85557396.

The previous prime is 85557389. The next prime is 85557443. The reversal of 85557397 is 79375558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 28313041 = 7566^2 + 5321^2 .

It is a cyclic number.

It is not a de Polignac number, because 85557397 - 2³ = 85557389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85557397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85557097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42778698 + 42778699.

It is an arithmetic number, because the mean of its divisors is an integer number (42778699).

Almost surely, 2^85557397 is an apocalyptic number.

It is an amenable number.

85557397 is a deficient number, since it is larger than the sum of its proper divisors (1).

85557397 is an equidigital number, since it uses as much as digits as its factorization.

85557397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 49.

The square root of 85557397 is about 9249.7241580493. The cubic root of 85557397 is about 440.6419640837.

The spelling of 85557397 in words is "eighty-five million, five hundred fifty-seven thousand, three hundred ninety-seven".