2101539 has 16 divisors (see below), whose sum is σ = 3129984. Its totient is φ = 1243200.

The previous prime is 2101531. The next prime is 2101549. The reversal of 2101539 is 9351012.

It is not a de Polignac number, because 2101539 - 2³ = 2101531 is a prime.

2101539 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2101531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (195624).

2^2101539 is an apocalyptic number.

2101539 is a deficient number, since it is larger than the sum of its proper divisors (1028445).

2101539 is a wasteful number, since it uses less digits than its factorization.

2101539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 2101539 is about 1449.6685828147. The cubic root of 2101539 is about 128.0891915795.

The spelling of 2101539 in words is "two million, one hundred one thousand, five hundred thirty-nine".