49681921 has 2 divisors, whose sum is σ = 49681922. Its totient is φ = 49681920.

The previous prime is 49681897. The next prime is 49681943. The reversal of 49681921 is 12918694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39690000 + 9991921 = 6300^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 49681921 - 2²³ = 41293313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (49681981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24840960 + 24840961.

It is an arithmetic number, because the mean of its divisors is an integer number (24840961).

Almost surely, 2^49681921 is an apocalyptic number.

It is an amenable number.

49681921 is a deficient number, since it is larger than the sum of its proper divisors (1).

49681921 is an equidigital number, since it uses as much as digits as its factorization.

49681921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 49681921 is about 7048.5403453481. The cubic root of 49681921 is about 367.6202787072.

It can be divided in two parts, 4968 and 1921, that added together give a square (6889 = 83²).

The spelling of 49681921 in words is "forty-nine million, six hundred eighty-one thousand, nine hundred twenty-one".