49981391 has 2 divisors, whose sum is σ = 49981392. Its totient is φ = 49981390.

The previous prime is 49981357. The next prime is 49981409. The reversal of 49981391 is 19318994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49981391 - 2¹⁴ = 49965007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49981301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24990695 + 24990696.

It is an arithmetic number, because the mean of its divisors is an integer number (24990696).

Almost surely, 2^49981391 is an apocalyptic number.

49981391 is a deficient number, since it is larger than the sum of its proper divisors (1).

49981391 is an equidigital number, since it uses as much as digits as its factorization.

49981391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 44.

The square root of 49981391 is about 7069.7518343998. The cubic root of 49981391 is about 368.3574400980.

The spelling of 49981391 in words is "forty-nine million, nine hundred eighty-one thousand, three hundred ninety-one".