721902479 has 2 divisors, whose sum is σ = 721902480. Its totient is φ = 721902478.

The previous prime is 721902443. The next prime is 721902497. The reversal of 721902479 is 974209127.

Together with next prime (721902497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (974209127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721902479 - 2¹⁶ = 721836943 is a prime.

It is a super-2 number, since 2×721902479² = 1042286378372690882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721902409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360951239 + 360951240.

It is an arithmetic number, because the mean of its divisors is an integer number (360951240).

Almost surely, 2^721902479 is an apocalyptic number.

721902479 is a deficient number, since it is larger than the sum of its proper divisors (1).

721902479 is an equidigital number, since it uses as much as digits as its factorization.

721902479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 721902479 is about 26868.2429459018. The cubic root of 721902479 is about 897.0696789515.

The spelling of 721902479 in words is "seven hundred twenty-one million, nine hundred two thousand, four hundred seventy-nine".