124561639 has 2 divisors, whose sum is σ = 124561640. Its totient is φ = 124561638.

The previous prime is 124561631. The next prime is 124561667. The reversal of 124561639 is 936165421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 124561639 - 2³ = 124561631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 124561598 and 124561607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124561631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62280819 + 62280820.

It is an arithmetic number, because the mean of its divisors is an integer number (62280820).

Almost surely, 2^124561639 is an apocalyptic number.

124561639 is a deficient number, since it is larger than the sum of its proper divisors (1).

124561639 is an equidigital number, since it uses as much as digits as its factorization.

124561639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 124561639 is about 11160.7185700563. The cubic root of 124561639 is about 499.4148340956.

The spelling of 124561639 in words is "one hundred twenty-four million, five hundred sixty-one thousand, six hundred thirty-nine".