721501463 has 2 divisors, whose sum is σ = 721501464. Its totient is φ = 721501462.

The previous prime is 721501441. The next prime is 721501481. The reversal of 721501463 is 364105127.

It is a strong prime.

It is an emirp because it is prime and its reverse (364105127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721501463 - 2¹² = 721497367 is a prime.

It is a super-2 number, since 2×721501463² = 1041128722222280738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721501433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360750731 + 360750732.

It is an arithmetic number, because the mean of its divisors is an integer number (360750732).

Almost surely, 2^721501463 is an apocalyptic number.

721501463 is a deficient number, since it is larger than the sum of its proper divisors (1).

721501463 is an equidigital number, since it uses as much as digits as its factorization.

721501463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 721501463 is about 26860.7792701552. The cubic root of 721501463 is about 896.9035411249.

The spelling of 721501463 in words is "seven hundred twenty-one million, five hundred one thousand, four hundred sixty-three".