2915991 has 12 divisors (see below), whose sum is σ = 4536168. Its totient is φ = 1794384.

The previous prime is 2915989. The next prime is 2915999. The reversal of 2915991 is 1995192.

It is not a de Polignac number, because 2915991 - 2¹ = 2915989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2915999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12345 + ... + 12578.

It is an arithmetic number, because the mean of its divisors is an integer number (378014).

2^2915991 is an apocalyptic number.

2915991 is a deficient number, since it is larger than the sum of its proper divisors (1620177).

2915991 is a wasteful number, since it uses less digits than its factorization.

2915991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24942 (or 24939 counting only the distinct ones).

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

The square root of 2915991 is about 1707.6273012575. The cubic root of 2915991 is about 142.8659476954.

It can be divided in two parts, 291599 and 1, that added together give a square (291600 = 540²).

The spelling of 2915991 in words is "two million, nine hundred fifteen thousand, nine hundred ninety-one".