85122147049 has 9 divisors (see below), whose sum is σ = 85614240901. Its totient is φ = 84632870560.

The previous prime is 85122147037. The next prime is 85122147073. The reversal of 85122147049 is 94074122158.

The square root of 85122147049 is 291757.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 24836184025 + 60285963024 = 157595^2 + 245532^2 .

It is not a de Polignac number, because 85122147049 - 2²¹ = 85120049897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85122146996 and 85122147014.

It is not an unprimeable number, because it can be changed into a prime (85122147449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57475389 + ... + 57476869.

Almost surely, 2^85122147049 is an apocalyptic number.

85122147049 is the 291757-th square number.

85122147049 is the 145879-th centered octagonal number.

It is an amenable number.

85122147049 is a deficient number, since it is larger than the sum of its proper divisors (492093852).

85122147049 is an frugal number, since it uses more digits than its factorization.

85122147049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 85122147049 in words is "eighty-five billion, one hundred twenty-two million, one hundred forty-seven thousand, forty-nine".