31228115057 has 4 divisors (see below), whose sum is σ = 32871700080. Its totient is φ = 29584530036.

The previous prime is 31228115041. The next prime is 31228115071. The reversal of 31228115057 is 75051182213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31228115057 - 2⁴ = 31228115041 is a prime.

It is a super-2 number, since 2×31228115057² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31228115027) 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, 821792483 + ... + 821792520.

It is an arithmetic number, because the mean of its divisors is an integer number (8217925020).

Almost surely, 2^31228115057 is an apocalyptic number.

It is an amenable number.

31228115057 is a deficient number, since it is larger than the sum of its proper divisors (1643585023).

31228115057 is a wasteful number, since it uses less digits than its factorization.

31228115057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643585022.

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 31228115057 in words is "thirty-one billion, two hundred twenty-eight million, one hundred fifteen thousand, fifty-seven".