49143989 has 2 divisors, whose sum is σ = 49143990. Its totient is φ = 49143988.

The previous prime is 49143977. The next prime is 49144003. The reversal of 49143989 is 98934194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43335889 + 5808100 = 6583^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 49143989 - 2⁴ = 49143973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49143929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24571994 + 24571995.

It is an arithmetic number, because the mean of its divisors is an integer number (24571995).

Almost surely, 2^49143989 is an apocalyptic number.

It is an amenable number.

49143989 is a deficient number, since it is larger than the sum of its proper divisors (1).

49143989 is an equidigital number, since it uses as much as digits as its factorization.

49143989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 49143989 is about 7010.2773839556. The cubic root of 49143989 is about 366.2886556986.

The spelling of 49143989 in words is "forty-nine million, one hundred forty-three thousand, nine hundred eighty-nine".