751921 has 2 divisors, whose sum is σ = 751922. Its totient is φ = 751920.

The previous prime is 751913. The next prime is 751943. The reversal of 751921 is 129157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 12321 = 860^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 751921 - 2³ = 751913 is a prime.

751921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (751901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 375960 + 375961.

It is an arithmetic number, because the mean of its divisors is an integer number (375961).

2⁷⁵¹⁹²¹ is an apocalyptic number.

It is an amenable number.

751921 is a deficient number, since it is larger than the sum of its proper divisors (1).

751921 is an equidigital number, since it uses as much as digits as its factorization.

751921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 25.

The square root of 751921 is about 867.1337843724. The cubic root of 751921 is about 90.9335343665.

The spelling of 751921 in words is "seven hundred fifty-one thousand, nine hundred twenty-one".