37523221 has 4 divisors (see below), whose sum is σ = 37975392. Its totient is φ = 37071052.

The previous prime is 37523207. The next prime is 37523231. The reversal of 37523221 is 12232573.

37523221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 37523221 - 2⁷ = 37523093 is a prime.

It is a super-2 number, since 2×37523221² = 2815984228429682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37523231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225961 + ... + 226126.

It is an arithmetic number, because the mean of its divisors is an integer number (9493848).

Almost surely, 2^37523221 is an apocalyptic number.

It is an amenable number.

37523221 is a deficient number, since it is larger than the sum of its proper divisors (452171).

37523221 is an equidigital number, since it uses as much as digits as its factorization.

37523221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452170.

The product of its digits is 2520, while the sum is 25.

The square root of 37523221 is about 6125.6200502480. The cubic root of 37523221 is about 334.7855492412.

Adding to 37523221 its reverse (12232573), we get a palindrome (49755794).

The spelling of 37523221 in words is "thirty-seven million, five hundred twenty-three thousand, two hundred twenty-one".