12901591 has 8 divisors (see below), whose sum is σ = 13295744. Its totient is φ = 12511800.

The previous prime is 12901579. The next prime is 12901619. The reversal of 12901591 is 19510921.

12901591 = T₁₂₈ + T₁₂₉ + ... + T₄₂₉.

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 12901591 - 2²¹ = 10804439 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 (12901501) 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, 5500 + ... + 7486.

It is an arithmetic number, because the mean of its divisors is an integer number (1661968).

Almost surely, 2^12901591 is an apocalyptic number.

12901591 is a deficient number, since it is larger than the sum of its proper divisors (394153).

12901591 is a wasteful number, since it uses less digits than its factorization.

12901591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 12901591 is about 3591.8784778998. The cubic root of 12901591 is about 234.5386512395.

The spelling of 12901591 in words is "twelve million, nine hundred one thousand, five hundred ninety-one".