3157121 has 8 divisors (see below), whose sum is σ = 3646944. Its totient is φ = 2701120.

The previous prime is 3157117. The next prime is 3157127. The reversal of 3157121 is 1217513.

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 3157121 - 2² = 3157117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3157093 and 3157102.

It is not an unprimeable number, because it can be changed into a prime (3157127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8255 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (455868).

Almost surely, 2^3157121 is an apocalyptic number.

It is an amenable number.

3157121 is a deficient number, since it is larger than the sum of its proper divisors (489823).

3157121 is a wasteful number, since it uses less digits than its factorization.

3157121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16911.

The product of its digits is 210, while the sum is 20.

The square root of 3157121 is about 1776.8289169191. The cubic root of 3157121 is about 146.7000997015.

The spelling of 3157121 in words is "three million, one hundred fifty-seven thousand, one hundred twenty-one".