621263261 has 2 divisors, whose sum is σ = 621263262. Its totient is φ = 621263260.

The previous prime is 621263239. The next prime is 621263303. The reversal of 621263261 is 162362126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620508100 + 755161 = 24910^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 621263261 - 2¹⁴ = 621246877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621263231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310631630 + 310631631.

It is an arithmetic number, because the mean of its divisors is an integer number (310631631).

Almost surely, 2^621263261 is an apocalyptic number.

It is an amenable number.

621263261 is a deficient number, since it is larger than the sum of its proper divisors (1).

621263261 is an equidigital number, since it uses as much as digits as its factorization.

621263261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 621263261 is about 24925.1531790679. The cubic root of 621263261 is about 853.2806371912.

The spelling of 621263261 in words is "six hundred twenty-one million, two hundred sixty-three thousand, two hundred sixty-one".