2515981 has 8 divisors (see below), whose sum is σ = 2737280. Its totient is φ = 2298672.

The previous prime is 2515967. The next prime is 2516021. The reversal of 2515981 is 1895152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2515981 - 2⁷ = 2515853 is a prime.

It is a super-2 number, since 2×2515981² = 12660320784722, which contains 22 as substring.

2515981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (342160).

2^2515981 is an apocalyptic number.

It is an amenable number.

2515981 is a deficient number, since it is larger than the sum of its proper divisors (221299).

2515981 is a wasteful number, since it uses less digits than its factorization.

2515981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995.

The product of its digits is 3600, while the sum is 31.

The square root of 2515981 is about 1586.1844155079. The cubic root of 2515981 is about 136.0094608470.

The spelling of 2515981 in words is "two million, five hundred fifteen thousand, nine hundred eighty-one".