49931897 has 2 divisors, whose sum is σ = 49931898. Its totient is φ = 49931896.

The previous prime is 49931879. The next prime is 49931899. The reversal of 49931897 is 79813994.

Together with previous prime (49931879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49716601 + 215296 = 7051^2 + 464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49931897 is a prime.

Together with 49931899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (49931899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24965948 + 24965949.

It is an arithmetic number, because the mean of its divisors is an integer number (24965949).

Almost surely, 2^49931897 is an apocalyptic number.

It is an amenable number.

49931897 is a deficient number, since it is larger than the sum of its proper divisors (1).

49931897 is an equidigital number, since it uses as much as digits as its factorization.

49931897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 49931897 is about 7066.2505616487. The cubic root of 49931897 is about 368.2358114679.

The spelling of 49931897 in words is "forty-nine million, nine hundred thirty-one thousand, eight hundred ninety-seven".