2151542 has 4 divisors (see below), whose sum is σ = 3227316. Its totient is φ = 1075770.

The previous prime is 2151533. The next prime is 2151563. The reversal of 2151542 is 2451512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537884 + ... + 537887.

It is an arithmetic number, because the mean of its divisors is an integer number (806829).

2^2151542 is an apocalyptic number.

2151542 is a deficient number, since it is larger than the sum of its proper divisors (1075774).

2151542 is a wasteful number, since it uses less digits than its factorization.

2151542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075773.

The product of its digits is 400, while the sum is 20.

The square root of 2151542 is about 1466.8135532507. The cubic root of 2151542 is about 129.0971365411.

The spelling of 2151542 in words is "two million, one hundred fifty-one thousand, five hundred forty-two".