5637751221 has 4 divisors (see below), whose sum is σ = 7517001632. Its totient is φ = 3758500812.

The previous prime is 5637751183. The next prime is 5637751261. The reversal of 5637751221 is 1221577365.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5637751221 - 2²¹ = 5635654069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5637751221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5637751261) 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, 939625201 + ... + 939625206.

It is an arithmetic number, because the mean of its divisors is an integer number (1879250408).

Almost surely, 2^5637751221 is an apocalyptic number.

It is an amenable number.

5637751221 is a deficient number, since it is larger than the sum of its proper divisors (1879250411).

5637751221 is a wasteful number, since it uses less digits than its factorization.

5637751221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879250410.

The product of its digits is 88200, while the sum is 39.

The square root of 5637751221 is about 75084.9600186349. The cubic root of 5637751221 is about 1779.7894820048.

The spelling of 5637751221 in words is "five billion, six hundred thirty-seven million, seven hundred fifty-one thousand, two hundred twenty-one".