124521691387 has 2 divisors, whose sum is σ = 124521691388. Its totient is φ = 124521691386.

The previous prime is 124521691381. The next prime is 124521691397. The reversal of 124521691387 is 783196125421.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 124521691387 - 2²³ = 124513302779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124521691387.

It is not a weakly prime, because it can be changed into another prime (124521691381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62260845693 + 62260845694.

It is an arithmetic number, because the mean of its divisors is an integer number (62260845694).

Almost surely, 2^124521691387 is an apocalyptic number.

124521691387 is a deficient number, since it is larger than the sum of its proper divisors (1).

124521691387 is an equidigital number, since it uses as much as digits as its factorization.

124521691387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The spelling of 124521691387 in words is "one hundred twenty-four billion, five hundred twenty-one million, six hundred ninety-one thousand, three hundred eighty-seven".