615131161 has 4 divisors (see below), whose sum is σ = 616394752. Its totient is φ = 613867572.

The previous prime is 615131131. The next prime is 615131189. The reversal of 615131161 is 161131516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 615131161 - 2⁵ = 615131129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615131131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631065 + ... + 632038.

It is an arithmetic number, because the mean of its divisors is an integer number (154098688).

Almost surely, 2^615131161 is an apocalyptic number.

It is an amenable number.

615131161 is a deficient number, since it is larger than the sum of its proper divisors (1263591).

615131161 is a wasteful number, since it uses less digits than its factorization.

615131161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263590.

The product of its digits is 540, while the sum is 25.

The square root of 615131161 is about 24801.8378552881. The cubic root of 615131161 is about 850.4639501791.

Adding to 615131161 its reverse (161131516), we get a palindrome (776262677).

The spelling of 615131161 in words is "six hundred fifteen million, one hundred thirty-one thousand, one hundred sixty-one".