721354401 has 6 divisors (see below), whose sum is σ = 1041956370. Its totient is φ = 480902928.

The previous prime is 721354373. The next prime is 721354429. The reversal of 721354401 is 104453127.

721354401 is a `hidden beast` number, since 7 + 213 + 5 + 440 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (721354373) and next prime (721354429).

It can be written as a sum of positive squares in only one way, i.e., 525326400 + 196028001 = 22920^2 + 14001^2 .

It is not a de Polignac number, because 721354401 - 2⁷ = 721354273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721354201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40075236 + ... + 40075253.

It is an arithmetic number, because the mean of its divisors is an integer number (173659395).

Almost surely, 2^721354401 is an apocalyptic number.

It is an amenable number.

721354401 is a deficient number, since it is larger than the sum of its proper divisors (320601969).

721354401 is a wasteful number, since it uses less digits than its factorization.

721354401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80150495 (or 80150492 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 721354401 is about 26858.0416449152. The cubic root of 721354401 is about 896.8425990488.

The spelling of 721354401 in words is "seven hundred twenty-one million, three hundred fifty-four thousand, four hundred one".