721027487 has 2 divisors, whose sum is σ = 721027488. Its totient is φ = 721027486.

The previous prime is 721027459. The next prime is 721027499. The reversal of 721027487 is 784720127.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (784720127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721027487 - 2⁸ = 721027231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721027487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721027187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360513743 + 360513744.

It is an arithmetic number, because the mean of its divisors is an integer number (360513744).

Almost surely, 2^721027487 is an apocalyptic number.

721027487 is a deficient number, since it is larger than the sum of its proper divisors (1).

721027487 is an equidigital number, since it uses as much as digits as its factorization.

721027487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 721027487 is about 26851.9549940037. The cubic root of 721027487 is about 896.7070971361.

The spelling of 721027487 in words is "seven hundred twenty-one million, twenty-seven thousand, four hundred eighty-seven".