3157547081 has 4 divisors (see below), whose sum is σ = 3400435332. Its totient is φ = 2914658832.

The previous prime is 3157547051. The next prime is 3157547089. The reversal of 3157547081 is 1807457513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1807457513 = 4289 ⋅421417.

It can be written as a sum of positive squares in 2 ways, for example, as 758506681 + 2399040400 = 27541^2 + 48980^2 .

It is a cyclic number.

It is not a de Polignac number, because 3157547081 - 2²² = 3153352777 is a prime.

It is a super-2 number, since 2×3157547081² = 19940207137463241122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3157547089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121444106 + ... + 121444131.

It is an arithmetic number, because the mean of its divisors is an integer number (850108833).

Almost surely, 2^3157547081 is an apocalyptic number.

It is an amenable number.

3157547081 is a deficient number, since it is larger than the sum of its proper divisors (242888251).

3157547081 is a wasteful number, since it uses less digits than its factorization.

3157547081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242888250.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 3157547081 is about 56192.0553192353. The cubic root of 3157547081 is about 1467.0669889040.

The spelling of 3157547081 in words is "three billion, one hundred fifty-seven million, five hundred forty-seven thousand, eighty-one".