49181491 has 2 divisors, whose sum is σ = 49181492. Its totient is φ = 49181490.

The previous prime is 49181479. The next prime is 49181497. The reversal of 49181491 is 19418194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49181491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49181491.

It is not a weakly prime, because it can be changed into another prime (49181497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24590745 + 24590746.

It is an arithmetic number, because the mean of its divisors is an integer number (24590746).

Almost surely, 2^49181491 is an apocalyptic number.

49181491 is a deficient number, since it is larger than the sum of its proper divisors (1).

49181491 is an equidigital number, since it uses as much as digits as its factorization.

49181491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 37.

The square root of 49181491 is about 7012.9516610340. The cubic root of 49181491 is about 366.3818041845.

The spelling of 49181491 in words is "forty-nine million, one hundred eighty-one thousand, four hundred ninety-one".