621126452 has 6 divisors (see below), whose sum is σ = 1086971298. Its totient is φ = 310563224.

The previous prime is 621126449. The next prime is 621126463. The reversal of 621126452 is 254621126.

It can be written as a sum of positive squares in only one way, i.e., 538425616 + 82700836 = 23204^2 + 9094^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77640803 + ... + 77640810.

It is an arithmetic number, because the mean of its divisors is an integer number (181161883).

Almost surely, 2^621126452 is an apocalyptic number.

It is an amenable number.

621126452 is a deficient number, since it is larger than the sum of its proper divisors (465844846).

621126452 is a wasteful number, since it uses less digits than its factorization.

621126452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155281617 (or 155281615 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 621126452 is about 24922.4086315910. The cubic root of 621126452 is about 853.2179986674.

Adding to 621126452 its reverse (254621126), we get a palindrome (875747578).

The spelling of 621126452 in words is "six hundred twenty-one million, one hundred twenty-six thousand, four hundred fifty-two".