61504331 has 8 divisors (see below), whose sum is σ = 72714720. Its totient is φ = 50899968.

The previous prime is 61504309. The next prime is 61504337. The reversal of 61504331 is 13340516.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61504331 is a prime.

It is a super-2 number, since 2×61504331² = 7565565463515122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61504297 and 61504306.

It is not an unprimeable number, because it can be changed into a prime (61504337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151286 + ... + 151691.

It is an arithmetic number, because the mean of its divisors is an integer number (9089340).

Almost surely, 2^61504331 is an apocalyptic number.

61504331 is a deficient number, since it is larger than the sum of its proper divisors (11210389).

61504331 is a wasteful number, since it uses less digits than its factorization.

61504331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303013.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 61504331 is about 7842.4697002921. The cubic root of 61504331 is about 394.7316042436.

Adding to 61504331 its reverse (13340516), we get a palindrome (74844847).

The spelling of 61504331 in words is "sixty-one million, five hundred four thousand, three hundred thirty-one".