721012847 has 2 divisors, whose sum is σ = 721012848. Its totient is φ = 721012846.

The previous prime is 721012793. The next prime is 721012871. The reversal of 721012847 is 748210127.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721012847 - 2¹⁸ = 720750703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721012547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360506423 + 360506424.

It is an arithmetic number, because the mean of its divisors is an integer number (360506424).

Almost surely, 2^721012847 is an apocalyptic number.

721012847 is a deficient number, since it is larger than the sum of its proper divisors (1).

721012847 is an equidigital number, since it uses as much as digits as its factorization.

721012847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 721012847 is about 26851.6823867705. The cubic root of 721012847 is about 896.7010280744.

The spelling of 721012847 in words is "seven hundred twenty-one million, twelve thousand, eight hundred forty-seven".