4621261621 has 4 divisors (see below), whose sum is σ = 4780615500. Its totient is φ = 4461907744.

The previous prime is 4621261609. The next prime is 4621261661. The reversal of 4621261621 is 1261621264.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1094683396 + 3526578225 = 33086^2 + 59385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4621261621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4621261661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79676896 + ... + 79676953.

It is an arithmetic number, because the mean of its divisors is an integer number (1195153875).

Almost surely, 2^4621261621 is an apocalyptic number.

It is an amenable number.

4621261621 is a deficient number, since it is larger than the sum of its proper divisors (159353879).

4621261621 is a wasteful number, since it uses less digits than its factorization.

4621261621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159353878.

The product of its digits is 6912, while the sum is 31.

The square root of 4621261621 is about 67979.8618783534. The cubic root of 4621261621 is about 1665.6619000192.

Adding to 4621261621 its reverse (1261621264), we get a palindrome (5882882885).

The spelling of 4621261621 in words is "four billion, six hundred twenty-one million, two hundred sixty-one thousand, six hundred twenty-one".