2519991 has 20 divisors (see below), whose sum is σ = 3841992. Its totient is φ = 1645488.

The previous prime is 2519981. The next prime is 2520017. The reversal of 2519991 is 1999152.

It is not a de Polignac number, because 2519991 - 2⁹ = 2519479 is a prime.

2519991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2519911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4000 + ... + 4586.

2^2519991 is an apocalyptic number.

2519991 is a deficient number, since it is larger than the sum of its proper divisors (1322001).

2519991 is an equidigital number, since it uses as much as digits as its factorization.

2519991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 643 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 2519991 is about 1587.4479519027. The cubic root of 2519991 is about 136.0816803167.

The spelling of 2519991 in words is "two million, five hundred nineteen thousand, nine hundred ninety-one".