49980989 has 2 divisors, whose sum is σ = 49980990. Its totient is φ = 49980988.

The previous prime is 49980979. The next prime is 49980991. The reversal of 49980989 is 98908994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49140100 + 840889 = 7010^2 + 917^2 .

It is a cyclic number.

It is not a de Polignac number, because 49980989 - 2²⁰ = 48932413 is a prime.

It is a super-2 number, since 2×49980989² = 4996198522836242, which contains 22 as substring.

Together with 49980991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49980919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24990494 + 24990495.

It is an arithmetic number, because the mean of its divisors is an integer number (24990495).

Almost surely, 2^49980989 is an apocalyptic number.

It is an amenable number.

49980989 is a deficient number, since it is larger than the sum of its proper divisors (1).

49980989 is an equidigital number, since it uses as much as digits as its factorization.

49980989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 49980989 is about 7069.7234033589. The cubic root of 49980989 is about 368.3564525299.

The spelling of 49980989 in words is "forty-nine million, nine hundred eighty thousand, nine hundred eighty-nine".