722131381 has 2 divisors, whose sum is σ = 722131382. Its totient is φ = 722131380.

The previous prime is 722131373. The next prime is 722131393. The reversal of 722131381 is 183131227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597362481 + 124768900 = 24441^2 + 11170^2 .

It is a cyclic number.

It is not a de Polignac number, because 722131381 - 2³ = 722131373 is a prime.

It is a super-2 number, since 2×722131381² = 1042947462849934322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722131301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361065690 + 361065691.

It is an arithmetic number, because the mean of its divisors is an integer number (361065691).

Almost surely, 2^722131381 is an apocalyptic number.

It is an amenable number.

722131381 is a deficient number, since it is larger than the sum of its proper divisors (1).

722131381 is an equidigital number, since it uses as much as digits as its factorization.

722131381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 722131381 is about 26872.5023211461. The cubic root of 722131381 is about 897.1644836978.

The spelling of 722131381 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, three hundred eighty-one".