12961591 has 8 divisors (see below), whose sum is σ = 13722800. Its totient is φ = 12208320.

The previous prime is 12961583. The next prime is 12961601. The reversal of 12961591 is 19516921.

It is a happy number.

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 12961591 - 2³ = 12961583 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 (12961561) 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, 1555 + ... + 5323.

It is an arithmetic number, because the mean of its divisors is an integer number (1715350).

Almost surely, 2^12961591 is an apocalyptic number.

12961591 is a deficient number, since it is larger than the sum of its proper divisors (761209).

12961591 is a wasteful number, since it uses less digits than its factorization.

12961591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969.

The product of its digits is 4860, while the sum is 34.

The square root of 12961591 is about 3600.2209654409. The cubic root of 12961591 is about 234.9016700435.

The spelling of 12961591 in words is "twelve million, nine hundred sixty-one thousand, five hundred ninety-one".