124640990731 has 4 divisors (see below), whose sum is σ = 127292926752. Its totient is φ = 121989054712.

The previous prime is 124640990701. The next prime is 124640990741. The reversal of 124640990731 is 137099046421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 124640990731 - 2⁹ = 124640990219 is a prime.

It is a super-2 number, since 2×124640990731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124640990701) 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 in 3 ways as a sum of consecutive naturals, for example, 1325967940 + ... + 1325968033.

It is an arithmetic number, because the mean of its divisors is an integer number (31823231688).

Almost surely, 2^124640990731 is an apocalyptic number.

124640990731 is a deficient number, since it is larger than the sum of its proper divisors (2651936021).

124640990731 is an equidigital number, since it uses as much as digits as its factorization.

124640990731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651936020.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 124640990731 in words is "one hundred twenty-four billion, six hundred forty million, nine hundred ninety thousand, seven hundred thirty-one".