2157541 has 4 divisors (see below), whose sum is σ = 2178592. Its totient is φ = 2136492.

The previous prime is 2157539. The next prime is 2157557. The reversal of 2157541 is 1457512.

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 2157541 - 2¹ = 2157539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157511) 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, 10371 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (544648).

2^2157541 is an apocalyptic number.

It is an amenable number.

2157541 is a deficient number, since it is larger than the sum of its proper divisors (21051).

2157541 is a wasteful number, since it uses less digits than its factorization.

2157541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21050.

The product of its digits is 1400, while the sum is 25.

The square root of 2157541 is about 1468.8570386528. The cubic root of 2157541 is about 129.2170094895.

The spelling of 2157541 in words is "two million, one hundred fifty-seven thousand, five hundred forty-one".