3137721 has 4 divisors (see below), whose sum is σ = 4183632. Its totient is φ = 2091812.

The previous prime is 3137699. The next prime is 3137723. The reversal of 3137721 is 1277313.

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 3137721 - 2⁷ = 3137593 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 3137691 and 3137700.

It is not an unprimeable number, because it can be changed into a prime (3137723) 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, 522951 + ... + 522956.

It is an arithmetic number, because the mean of its divisors is an integer number (1045908).

Almost surely, 2^3137721 is an apocalyptic number.

It is an amenable number.

3137721 is a deficient number, since it is larger than the sum of its proper divisors (1045911).

3137721 is a wasteful number, since it uses less digits than its factorization.

3137721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045910.

The product of its digits is 882, while the sum is 24.

The square root of 3137721 is about 1771.3613408901. The cubic root of 3137721 is about 146.3989992914.

The spelling of 3137721 in words is "three million, one hundred thirty-seven thousand, seven hundred twenty-one".