124991551 has 2 divisors, whose sum is σ = 124991552. Its totient is φ = 124991550.

The previous prime is 124991527. The next prime is 124991563. The reversal of 124991551 is 155199421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 124991551 - 2¹⁷ = 124860479 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124991551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124991521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62495775 + 62495776.

It is an arithmetic number, because the mean of its divisors is an integer number (62495776).

Almost surely, 2^124991551 is an apocalyptic number.

124991551 is a deficient number, since it is larger than the sum of its proper divisors (1).

124991551 is an equidigital number, since it uses as much as digits as its factorization.

124991551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 37.

The square root of 124991551 is about 11179.9620303470. The cubic root of 124991551 is about 499.9887344128.

The spelling of 124991551 in words is "one hundred twenty-four million, nine hundred ninety-one thousand, five hundred fifty-one".