721674053 has 2 divisors, whose sum is σ = 721674054. Its totient is φ = 721674052.

The previous prime is 721674029. The next prime is 721674073. The reversal of 721674053 is 350476127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431891524 + 289782529 = 20782^2 + 17023^2 .

It is an emirp because it is prime and its reverse (350476127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721674053 - 2¹⁴ = 721657669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721674073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837026 + 360837027.

It is an arithmetic number, because the mean of its divisors is an integer number (360837027).

Almost surely, 2^721674053 is an apocalyptic number.

It is an amenable number.

721674053 is a deficient number, since it is larger than the sum of its proper divisors (1).

721674053 is an equidigital number, since it uses as much as digits as its factorization.

721674053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 721674053 is about 26863.9917547635. The cubic root of 721674053 is about 896.9750513707.

The spelling of 721674053 in words is "seven hundred twenty-one million, six hundred seventy-four thousand, fifty-three".