722157231 has 32 divisors (see below), whose sum is σ = 1023176448. Its totient is φ = 452424960.

The previous prime is 722157199. The next prime is 722157251. The reversal of 722157231 is 132751227.

It is not a de Polignac number, because 722157231 - 2⁵ = 722157199 is a prime.

It is a super-2 number, since 2×722157231² = 1043022132571174722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722157251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 486216 + ... + 487698.

It is an arithmetic number, because the mean of its divisors is an integer number (31974264).

Almost surely, 2^722157231 is an apocalyptic number.

722157231 is a deficient number, since it is larger than the sum of its proper divisors (301019217).

722157231 is a wasteful number, since it uses less digits than its factorization.

722157231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671.

The product of its digits is 5880, while the sum is 30.

The square root of 722157231 is about 26872.9832917747. The cubic root of 722157231 is about 897.1751887790.

The spelling of 722157231 in words is "seven hundred twenty-two million, one hundred fifty-seven thousand, two hundred thirty-one".