61864331 has 2 divisors, whose sum is σ = 61864332. Its totient is φ = 61864330.

The previous prime is 61864307. The next prime is 61864373. The reversal of 61864331 is 13346816.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61864331 is a prime.

It is a super-2 number, since 2×61864331² = 7654390900155122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61863331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932165 + 30932166.

It is an arithmetic number, because the mean of its divisors is an integer number (30932166).

Almost surely, 2^61864331 is an apocalyptic number.

61864331 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864331 is an equidigital number, since it uses as much as digits as its factorization.

61864331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 61864331 is about 7865.3881658822. The cubic root of 61864331 is about 395.5002602496.

The spelling of 61864331 in words is "sixty-one million, eight hundred sixty-four thousand, three hundred thirty-one".