721027451 has 2 divisors, whose sum is σ = 721027452. Its totient is φ = 721027450.

The previous prime is 721027429. The next prime is 721027459. The reversal of 721027451 is 154720127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721027451 - 2¹⁸ = 720765307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721027459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360513725 + 360513726.

It is an arithmetic number, because the mean of its divisors is an integer number (360513726).

Almost surely, 2^721027451 is an apocalyptic number.

721027451 is a deficient number, since it is larger than the sum of its proper divisors (1).

721027451 is an equidigital number, since it uses as much as digits as its factorization.

721027451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 721027451 is about 26851.9543236614. The cubic root of 721027451 is about 896.7070822122.

Adding to 721027451 its reverse (154720127), we get a palindrome (875747578).

The spelling of 721027451 in words is "seven hundred twenty-one million, twenty-seven thousand, four hundred fifty-one".