315221137 has 8 divisors (see below), whose sum is σ = 393003072. Its totient is φ = 245626800.

The previous prime is 315221117. The next prime is 315221143. The reversal of 315221137 is 731122513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 315221137 - 2¹¹ = 315219089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (315221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2046814 + ... + 2046967.

It is an arithmetic number, because the mean of its divisors is an integer number (49125384).

Almost surely, 2^315221137 is an apocalyptic number.

It is an amenable number.

315221137 is a deficient number, since it is larger than the sum of its proper divisors (77781935).

315221137 is a wasteful number, since it uses less digits than its factorization.

315221137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093799.

The product of its digits is 1260, while the sum is 25.

The square root of 315221137 is about 17754.4680855271. The cubic root of 315221137 is about 680.5683951466.

The spelling of 315221137 in words is "three hundred fifteen million, two hundred twenty-one thousand, one hundred thirty-seven".