621286247 has 2 divisors, whose sum is σ = 621286248. Its totient is φ = 621286246.

The previous prime is 621286241. The next prime is 621286297. The reversal of 621286247 is 742682126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621286247 - 2¹⁶ = 621220711 is a prime.

It is a super-2 number, since 2×621286247² = 771993201422690018, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621286247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621286241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310643123 + 310643124.

It is an arithmetic number, because the mean of its divisors is an integer number (310643124).

Almost surely, 2^621286247 is an apocalyptic number.

621286247 is a deficient number, since it is larger than the sum of its proper divisors (1).

621286247 is an equidigital number, since it uses as much as digits as its factorization.

621286247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 621286247 is about 24925.6142752792. The cubic root of 621286247 is about 853.2911605168.

The spelling of 621286247 in words is "six hundred twenty-one million, two hundred eighty-six thousand, two hundred forty-seven".