312157121 has 8 divisors (see below), whose sum is σ = 318337344. Its totient is φ = 305987760.

The previous prime is 312157093. The next prime is 312157129. The reversal of 312157121 is 121751213.

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 312157121 - 2⁶ = 312157057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312157129) 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, 79220 + ... + 83066.

It is an arithmetic number, because the mean of its divisors is an integer number (39792168).

Almost surely, 2^312157121 is an apocalyptic number.

It is an amenable number.

312157121 is a deficient number, since it is larger than the sum of its proper divisors (6180223).

312157121 is a wasteful number, since it uses less digits than its factorization.

312157121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431.

The product of its digits is 420, while the sum is 23.

The square root of 312157121 is about 17667.9687853471. The cubic root of 312157121 is about 678.3561221744.

The spelling of 312157121 in words is "three hundred twelve million, one hundred fifty-seven thousand, one hundred twenty-one".