621126449 has 2 divisors, whose sum is σ = 621126450. Its totient is φ = 621126448.

The previous prime is 621126439. The next prime is 621126463. The reversal of 621126449 is 944621126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616032400 + 5094049 = 24820^2 + 2257^2 .

It is a cyclic number.

It is not a de Polignac number, because 621126449 - 2⁸ = 621126193 is a prime.

It is not a weakly prime, because it can be changed into another prime (621126439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310563224 + 310563225.

It is an arithmetic number, because the mean of its divisors is an integer number (310563225).

Almost surely, 2^621126449 is an apocalyptic number.

It is an amenable number.

621126449 is a deficient number, since it is larger than the sum of its proper divisors (1).

621126449 is an equidigital number, since it uses as much as digits as its factorization.

621126449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 621126449 is about 24922.4085714042. The cubic root of 621126449 is about 853.2179972938.

The spelling of 621126449 in words is "six hundred twenty-one million, one hundred twenty-six thousand, four hundred forty-nine".