3157145 has 4 divisors (see below), whose sum is σ = 3788580. Its totient is φ = 2525712.

The previous prime is 3157139. The next prime is 3157151. The reversal of 3157145 is 5417513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5417513 = 71 ⋅76303.

It is an interprime number because it is at equal distance from previous prime (3157139) and next prime (3157151).

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 1792921 = 1168^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 3157145 - 2⁶ = 3157081 is a prime.

It is a super-3 number, since 3×3157145³ = 94407139753337470875, which contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315710 + ... + 315719.

It is an arithmetic number, because the mean of its divisors is an integer number (947145).

Almost surely, 2^3157145 is an apocalyptic number.

It is an amenable number.

3157145 is a deficient number, since it is larger than the sum of its proper divisors (631435).

3157145 is an equidigital number, since it uses as much as digits as its factorization.

3157145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631434.

The product of its digits is 2100, while the sum is 26.

The square root of 3157145 is about 1776.8356705109. The cubic root of 3157145 is about 146.7004714319.

The spelling of 3157145 in words is "three million, one hundred fifty-seven thousand, one hundred forty-five".