61418639 has 2 divisors, whose sum is σ = 61418640. Its totient is φ = 61418638.

The previous prime is 61418611. The next prime is 61418647. The reversal of 61418639 is 93681416.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61418639 is a prime.

It is a super-2 number, since 2×61418639² = 7544498433224642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61418239) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30709319 + 30709320.

It is an arithmetic number, because the mean of its divisors is an integer number (30709320).

Almost surely, 2^61418639 is an apocalyptic number.

61418639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61418639 is an equidigital number, since it uses as much as digits as its factorization.

61418639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 61418639 is about 7837.0044659934. The cubic root of 61418639 is about 394.5481967692.

The spelling of 61418639 in words is "sixty-one million, four hundred eighteen thousand, six hundred thirty-nine".