621496493 has 2 divisors, whose sum is σ = 621496494. Its totient is φ = 621496492.

The previous prime is 621496483. The next prime is 621496529. The reversal of 621496493 is 394694126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579220489 + 42276004 = 24067^2 + 6502^2 .

It is a cyclic number.

It is not a de Polignac number, because 621496493 - 2⁶ = 621496429 is a prime.

It is a super-2 number, since 2×621496493² = 772515781622598098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621496423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310748246 + 310748247.

It is an arithmetic number, because the mean of its divisors is an integer number (310748247).

Almost surely, 2^621496493 is an apocalyptic number.

It is an amenable number.

621496493 is a deficient number, since it is larger than the sum of its proper divisors (1).

621496493 is an equidigital number, since it uses as much as digits as its factorization.

621496493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 621496493 is about 24929.8313873159. The cubic root of 621496493 is about 853.3874021560.

The spelling of 621496493 in words is "six hundred twenty-one million, four hundred ninety-six thousand, four hundred ninety-three".