49491391 has 2 divisors, whose sum is σ = 49491392. Its totient is φ = 49491390.

The previous prime is 49491389. The next prime is 49491413. The reversal of 49491391 is 19319494.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49491391 - 2¹ = 49491389 is a prime.

It is a super-2 number, since 2×49491391² = 4898795566229762, which contains 22 as substring.

Together with 49491389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49491361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24745695 + 24745696.

It is an arithmetic number, because the mean of its divisors is an integer number (24745696).

Almost surely, 2^49491391 is an apocalyptic number.

49491391 is a deficient number, since it is larger than the sum of its proper divisors (1).

49491391 is an equidigital number, since it uses as much as digits as its factorization.

49491391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 49491391 is about 7035.0117981422. The cubic root of 49491391 is about 367.1497358392.

The spelling of 49491391 in words is "forty-nine million, four hundred ninety-one thousand, three hundred ninety-one".