85779157 has 2 divisors, whose sum is σ = 85779158. Its totient is φ = 85779156.

The previous prime is 85779131. The next prime is 85779191. The reversal of 85779157 is 75197758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54037201 + 31741956 = 7351^2 + 5634^2 .

It is a cyclic number.

It is not a de Polignac number, because 85779157 - 2¹⁵ = 85746389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85779157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85779107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42889578 + 42889579.

It is an arithmetic number, because the mean of its divisors is an integer number (42889579).

Almost surely, 2^85779157 is an apocalyptic number.

It is an amenable number.

85779157 is a deficient number, since it is larger than the sum of its proper divisors (1).

85779157 is an equidigital number, since it uses as much as digits as its factorization.

85779157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 617400, while the sum is 49.

The square root of 85779157 is about 9261.7037849415. The cubic root of 85779157 is about 441.0223420961.

The spelling of 85779157 in words is "eighty-five million, seven hundred seventy-nine thousand, one hundred fifty-seven".