751297921 has 16 divisors (see below), whose sum is σ = 856510848. Its totient is φ = 652326400.

The previous prime is 751297889. The next prime is 751297973. The reversal of 751297921 is 129792157.

751297921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 751297921 - 2⁵ = 751297889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (751297991) 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, 205905 + ... + 209521.

It is an arithmetic number, because the mean of its divisors is an integer number (53531928).

Almost surely, 2^751297921 is an apocalyptic number.

It is an amenable number.

751297921 is a deficient number, since it is larger than the sum of its proper divisors (105212927).

751297921 is a wasteful number, since it uses less digits than its factorization.

751297921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472.

The product of its digits is 79380, while the sum is 43.

The square root of 751297921 is about 27409.8143189625. The cubic root of 751297921 is about 909.0841008130.

The spelling of 751297921 in words is "seven hundred fifty-one million, two hundred ninety-seven thousand, nine hundred twenty-one".