61607231 has 4 divisors (see below), whose sum is σ = 70408272. Its totient is φ = 52806192.

The previous prime is 61607209. The next prime is 61607233. The reversal of 61607231 is 13270616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61607231 is a prime.

It is a super-2 number, since 2×61607231² = 7590901822974722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61607231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61607233) 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, 4400510 + ... + 4400523.

It is an arithmetic number, because the mean of its divisors is an integer number (17602068).

Almost surely, 2^61607231 is an apocalyptic number.

61607231 is a deficient number, since it is larger than the sum of its proper divisors (8801041).

61607231 is an equidigital number, since it uses as much as digits as its factorization.

61607231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8801040.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 61607231 is about 7849.0273919767. The cubic root of 61607231 is about 394.9516172112.

Adding to 61607231 its reverse (13270616), we get a palindrome (74877847).

The spelling of 61607231 in words is "sixty-one million, six hundred seven thousand, two hundred thirty-one".