637149 has 4 divisors (see below), whose sum is σ = 849536. Its totient is φ = 424764.

The previous prime is 637139. The next prime is 637157. The reversal of 637149 is 941736.

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 637149 - 2¹² = 633053 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637129) 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, 106189 + ... + 106194.

It is an arithmetic number, because the mean of its divisors is an integer number (212384).

2⁶³⁷¹⁴⁹ is an apocalyptic number.

It is an amenable number.

637149 is a deficient number, since it is larger than the sum of its proper divisors (212387).

637149 is a wasteful number, since it uses less digits than its factorization.

637149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212386.

The product of its digits is 4536, while the sum is 30.

The square root of 637149 is about 798.2161361436. The cubic root of 637149 is about 86.0492326720.

The spelling of 637149 in words is "six hundred thirty-seven thousand, one hundred forty-nine".