61130231 has 4 divisors (see below), whose sum is σ = 63238200. Its totient is φ = 59022264.

The previous prime is 61130227. The next prime is 61130257. The reversal of 61130231 is 13203116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61130231 - 2² = 61130227 is a prime.

It is a super-2 number, since 2×61130231² = 7473810284226722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61130261) 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, 1053941 + ... + 1053998.

It is an arithmetic number, because the mean of its divisors is an integer number (15809550).

Almost surely, 2^61130231 is an apocalyptic number.

61130231 is a deficient number, since it is larger than the sum of its proper divisors (2107969).

61130231 is a wasteful number, since it uses less digits than its factorization.

61130231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107968.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 61130231 is about 7818.5824162696. The cubic root of 61130231 is about 393.9296579655.

Adding to 61130231 its reverse (13203116), we get a palindrome (74333347).

The spelling of 61130231 in words is "sixty-one million, one hundred thirty thousand, two hundred thirty-one".