2157537 has 4 divisors (see below), whose sum is σ = 2876720. Its totient is φ = 1438356.

The previous prime is 2157527. The next prime is 2157539. The reversal of 2157537 is 7357512.

2157537 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 not a de Polignac number, because 2157537 - 2¹⁵ = 2124769 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359587 + ... + 359592.

It is an arithmetic number, because the mean of its divisors is an integer number (719180).

2^2157537 is an apocalyptic number.

It is an amenable number.

2157537 is a deficient number, since it is larger than the sum of its proper divisors (719183).

2157537 is an equidigital number, since it uses as much as digits as its factorization.

2157537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719182.

The product of its digits is 7350, while the sum is 30.

The square root of 2157537 is about 1468.8556770493. The cubic root of 2157537 is about 129.2169296349.

It can be divided in two parts, 21575 and 37, that added together give a palindrome (21612).

The spelling of 2157537 in words is "two million, one hundred fifty-seven thousand, five hundred thirty-seven".