124920991 has 16 divisors (see below), whose sum is σ = 145448800. Its totient is φ = 106282368.

The previous prime is 124920989. The next prime is 124921001. The reversal of 124920991 is 199029421.

It is a cyclic number.

It is not a de Polignac number, because 124920991 - 2¹ = 124920989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 124920991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124920931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2305 + ... + 15973.

It is an arithmetic number, because the mean of its divisors is an integer number (9090550).

Almost surely, 2^124920991 is an apocalyptic number.

124920991 is a deficient number, since it is larger than the sum of its proper divisors (20527809).

124920991 is a wasteful number, since it uses less digits than its factorization.

124920991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13738.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 124920991 is about 11176.8059390865. The cubic root of 124920991 is about 499.8946324636.

The spelling of 124920991 in words is "one hundred twenty-four million, nine hundred twenty thousand, nine hundred ninety-one".