61288639 has 2 divisors, whose sum is σ = 61288640. Its totient is φ = 61288638.

The previous prime is 61288627. The next prime is 61288649. The reversal of 61288639 is 93688216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61288639 - 2⁹ = 61288127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61288595 and 61288604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61288609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30644319 + 30644320.

It is an arithmetic number, because the mean of its divisors is an integer number (30644320).

Almost surely, 2^61288639 is an apocalyptic number.

61288639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61288639 is an equidigital number, since it uses as much as digits as its factorization.

61288639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 61288639 is about 7828.7060872152. The cubic root of 61288639 is about 394.2696304301.

The spelling of 61288639 in words is "sixty-one million, two hundred eighty-eight thousand, six hundred thirty-nine".