621404361 has 6 divisors (see below), whose sum is σ = 897584090. Its totient is φ = 414269568.

The previous prime is 621404353. The next prime is 621404369. The reversal of 621404361 is 163404126.

621404361 is a `hidden beast` number, since 621 + 4 + 0 + 4 + 36 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (621404353) and next prime (621404369).

It can be written as a sum of positive squares in only one way, i.e., 506250000 + 115154361 = 22500^2 + 10731^2 .

It is not a de Polignac number, because 621404361 - 2³ = 621404353 is a prime.

It is a super-2 number, since 2×621404361² = 772286759739636642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621404369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34522456 + ... + 34522473.

Almost surely, 2^621404361 is an apocalyptic number.

It is an amenable number.

621404361 is a deficient number, since it is larger than the sum of its proper divisors (276179729).

621404361 is a wasteful number, since it uses less digits than its factorization.

621404361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69044935 (or 69044932 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 621404361 is about 24927.9834924528. The cubic root of 621404361 is about 853.3452307335.

Adding to 621404361 its reverse (163404126), we get a palindrome (784808487).

The spelling of 621404361 in words is "six hundred twenty-one million, four hundred four thousand, three hundred sixty-one".