721054673 has 2 divisors, whose sum is σ = 721054674. Its totient is φ = 721054672.

The previous prime is 721054639. The next prime is 721054837. The reversal of 721054673 is 376450127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509991889 + 211062784 = 22583^2 + 14528^2 .

It is an emirp because it is prime and its reverse (376450127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721054673 - 2⁸ = 721054417 is a prime.

It is not a weakly prime, because it can be changed into another prime (721051673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360527336 + 360527337.

It is an arithmetic number, because the mean of its divisors is an integer number (360527337).

Almost surely, 2^721054673 is an apocalyptic number.

It is an amenable number.

721054673 is a deficient number, since it is larger than the sum of its proper divisors (1).

721054673 is an equidigital number, since it uses as much as digits as its factorization.

721054673 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 721054673 is about 26852.4612093566. The cubic root of 721054673 is about 896.7183669666.

The spelling of 721054673 in words is "seven hundred twenty-one million, fifty-four thousand, six hundred seventy-three".