32491391 has 2 divisors, whose sum is σ = 32491392. Its totient is φ = 32491390.

The previous prime is 32491373. The next prime is 32491399. The reversal of 32491391 is 19319423.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 32491391 - 2¹⁴ = 32475007 is a prime.

It is a super-2 number, since 2×32491391² = 2111380978229762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32491399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16245695 + 16245696.

It is an arithmetic number, because the mean of its divisors is an integer number (16245696).

Almost surely, 2^32491391 is an apocalyptic number.

32491391 is a deficient number, since it is larger than the sum of its proper divisors (1).

32491391 is an equidigital number, since it uses as much as digits as its factorization.

32491391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 32491391 is about 5700.1220162379. The cubic root of 32491391 is about 319.0970345164.

The spelling of 32491391 in words is "thirty-two million, four hundred ninety-one thousand, three hundred ninety-one".