2157331 has 8 divisors (see below), whose sum is σ = 2456064. Its totient is φ = 1875720.

The previous prime is 2157329. The next prime is 2157341. The reversal of 2157331 is 1337512.

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

It is not a de Polignac number, because 2157331 - 2¹ = 2157329 is a prime.

It is a super-2 number, since 2×2157331² = 9308154087122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4011 + ... + 4516.

It is an arithmetic number, because the mean of its divisors is an integer number (307008).

2^2157331 is an apocalyptic number.

2157331 is a deficient number, since it is larger than the sum of its proper divisors (298733).

2157331 is a wasteful number, since it uses less digits than its factorization.

2157331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its digits is 630, while the sum is 22.

The square root of 2157331 is about 1468.7855527612. The cubic root of 2157331 is about 129.2128169925.

Adding to 2157331 its product of digits (630), we get a square (2157961 = 1469²).

The spelling of 2157331 in words is "two million, one hundred fifty-seven thousand, three hundred thirty-one".