2509951 has 4 divisors (see below), whose sum is σ = 2534904. Its totient is φ = 2485000.

The previous prime is 2509937. The next prime is 2509961. The reversal of 2509951 is 1599052.

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 2509951 - 2⁷ = 2509823 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 (2509961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12325 + ... + 12526.

It is an arithmetic number, because the mean of its divisors is an integer number (633726).

2^2509951 is an apocalyptic number.

2509951 is a deficient number, since it is larger than the sum of its proper divisors (24953).

2509951 is a wasteful number, since it uses less digits than its factorization.

2509951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24952.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 2509951 is about 1584.2824874371. The cubic root of 2509951 is about 135.9007168986.

Subtracting from 2509951 its sum of digits (31), we obtain a triangular number (2509920 = T₂₂₄₀).

It can be divided in two parts, 250 and 9951, that added together give a palindrome (10201).

The spelling of 2509951 in words is "two million, five hundred nine thousand, nine hundred fifty-one".