49555991 has 2 divisors, whose sum is σ = 49555992. Its totient is φ = 49555990.

The previous prime is 49555967. The next prime is 49555993. The reversal of 49555991 is 19955594.

49555991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49555991 - 2⁶ = 49555927 is a prime.

It is a Sophie Germain prime.

Together with 49555993, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 49555991 parts by 9955 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49555993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24777995 + 24777996.

It is an arithmetic number, because the mean of its divisors is an integer number (24777996).

Almost surely, 2^49555991 is an apocalyptic number.

49555991 is a deficient number, since it is larger than the sum of its proper divisors (1).

49555991 is an equidigital number, since it uses as much as digits as its factorization.

49555991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 47.

The square root of 49555991 is about 7039.6016222511. The cubic root of 49555991 is about 367.3094104847.

It can be divided in two parts, 49555 and 991, that multiplied together give a triangular number (49109005 = T₉₉₁₀).

The spelling of 49555991 in words is "forty-nine million, five hundred fifty-five thousand, nine hundred ninety-one".