721500157 has 16 divisors (see below), whose sum is σ = 842688000. Its totient is φ = 617482320.

The previous prime is 721500119. The next prime is 721500173. The reversal of 721500157 is 751005127.

It is not a de Polignac number, because 721500157 - 2²³ = 713111549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721500187) 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 15 ways as a sum of consecutive naturals, for example, 311319 + ... + 313627.

It is an arithmetic number, because the mean of its divisors is an integer number (52668000).

Almost surely, 2^721500157 is an apocalyptic number.

It is an amenable number.

721500157 is a deficient number, since it is larger than the sum of its proper divisors (121187843).

721500157 is an equidigital number, since it uses as much as digits as its factorization.

721500157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3227 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 721500157 is about 26860.7549596060. The cubic root of 721500157 is about 896.9029999587.

The spelling of 721500157 in words is "seven hundred twenty-one million, five hundred thousand, one hundred fifty-seven".