61780331 has 2 divisors, whose sum is σ = 61780332. Its totient is φ = 61780330.

The previous prime is 61780319. The next prime is 61780339. The reversal of 61780331 is 13308716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61780331 - 2²² = 57586027 is a prime.

It is a super-2 number, since 2×61780331² = 7633618596939122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61780294 and 61780303.

It is not a weakly prime, because it can be changed into another prime (61780339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30890165 + 30890166.

It is an arithmetic number, because the mean of its divisors is an integer number (30890166).

Almost surely, 2^61780331 is an apocalyptic number.

61780331 is a deficient number, since it is larger than the sum of its proper divisors (1).

61780331 is an equidigital number, since it uses as much as digits as its factorization.

61780331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 61780331 is about 7860.0465011347. The cubic root of 61780331 is about 395.3211744497.

The spelling of 61780331 in words is "sixty-one million, seven hundred eighty thousand, three hundred thirty-one".