756481021 has 8 divisors (see below), whose sum is σ = 778049240. Its totient is φ = 734971968.

The previous prime is 756481009. The next prime is 756481051. The reversal of 756481021 is 120184657.

It can be written as a sum of positive squares in 4 ways, for example, as 163558521 + 592922500 = 12789^2 + 24350^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 756481021 - 2²⁹ = 219610109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (756481001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11815 + ... + 40651.

It is an arithmetic number, because the mean of its divisors is an integer number (97256155).

Almost surely, 2^756481021 is an apocalyptic number.

It is an amenable number.

756481021 is a deficient number, since it is larger than the sum of its proper divisors (21568219).

756481021 is a wasteful number, since it uses less digits than its factorization.

756481021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29583.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 756481021 is about 27504.2000610816. The cubic root of 756481021 is about 911.1698599993.

The spelling of 756481021 in words is "seven hundred fifty-six million, four hundred eighty-one thousand, twenty-one".