9390131557 has 4 divisors (see below), whose sum is σ = 9402536716. Its totient is φ = 9377726400.

The previous prime is 9390131521. The next prime is 9390131561. The reversal of 9390131557 is 7551310939.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6658396801 + 2731734756 = 81599^2 + 52266^2 .

It is a cyclic number.

It is not a de Polignac number, because 9390131557 - 2¹⁵ = 9390098789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9390131957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6201444 + ... + 6202957.

It is an arithmetic number, because the mean of its divisors is an integer number (2350634179).

Almost surely, 2^9390131557 is an apocalyptic number.

It is an amenable number.

9390131557 is a deficient number, since it is larger than the sum of its proper divisors (12405159).

9390131557 is a wasteful number, since it uses less digits than its factorization.

9390131557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405158.

The product of its (nonzero) digits is 127575, while the sum is 43.

The square root of 9390131557 is about 96902.6911752197. The cubic root of 9390131557 is about 2109.7154934112.

The spelling of 9390131557 in words is "nine billion, three hundred ninety million, one hundred thirty-one thousand, five hundred fifty-seven".