721562053 has 2 divisors, whose sum is σ = 721562054. Its totient is φ = 721562052.

The previous prime is 721562011. The next prime is 721562099. The reversal of 721562053 is 350265127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 718347204 + 3214849 = 26802^2 + 1793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721562053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721562353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360781026 + 360781027.

It is an arithmetic number, because the mean of its divisors is an integer number (360781027).

Almost surely, 2^721562053 is an apocalyptic number.

It is an amenable number.

721562053 is a deficient number, since it is larger than the sum of its proper divisors (1).

721562053 is an equidigital number, since it uses as much as digits as its factorization.

721562053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 721562053 is about 26861.9070990874. The cubic root of 721562053 is about 896.9286470405.

The spelling of 721562053 in words is "seven hundred twenty-one million, five hundred sixty-two thousand, fifty-three".