2515551 has 4 divisors (see below), whose sum is σ = 3354072. Its totient is φ = 1677032.

The previous prime is 2515537. The next prime is 2515553. The reversal of 2515551 is 1555152.

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

It is a cyclic number.

It is not a de Polignac number, because 2515551 - 2⁹ = 2515039 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515553) 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, 419256 + ... + 419261.

It is an arithmetic number, because the mean of its divisors is an integer number (838518).

2^2515551 is an apocalyptic number.

2515551 is a deficient number, since it is larger than the sum of its proper divisors (838521).

2515551 is an equidigital number, since it uses as much as digits as its factorization.

2515551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838520.

The product of its digits is 1250, while the sum is 24.

The square root of 2515551 is about 1586.0488643166. The cubic root of 2515551 is about 136.0017120603.

It can be divided in two parts, 25 and 15551, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 2515551 in words is "two million, five hundred fifteen thousand, five hundred fifty-one".