722153491 has 2 divisors, whose sum is σ = 722153492. Its totient is φ = 722153490.

The previous prime is 722153431. The next prime is 722153521. The reversal of 722153491 is 194351227.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 722153491 - 2¹⁵ = 722120723 is a prime.

It is not a weakly prime, because it can be changed into another prime (722153431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361076745 + 361076746.

It is an arithmetic number, because the mean of its divisors is an integer number (361076746).

Almost surely, 2^722153491 is an apocalyptic number.

722153491 is a deficient number, since it is larger than the sum of its proper divisors (1).

722153491 is an equidigital number, since it uses as much as digits as its factorization.

722153491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 722153491 is about 26872.9137050674. The cubic root of 722153491 is about 897.1736399746.

The spelling of 722153491 in words is "seven hundred twenty-two million, one hundred fifty-three thousand, four hundred ninety-one".