49173989 has 2 divisors, whose sum is σ = 49173990. Its totient is φ = 49173988.

The previous prime is 49173947. The next prime is 49173997. The reversal of 49173989 is 98937194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24750625 + 24423364 = 4975^2 + 4942^2 .

It is a cyclic number.

It is not a de Polignac number, because 49173989 - 2¹⁶ = 49108453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49173389) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24586994 + 24586995.

It is an arithmetic number, because the mean of its divisors is an integer number (24586995).

Almost surely, 2^49173989 is an apocalyptic number.

It is an amenable number.

49173989 is a deficient number, since it is larger than the sum of its proper divisors (1).

49173989 is an equidigital number, since it uses as much as digits as its factorization.

49173989 is an evil number, because the sum of its binary digits is even.

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

The square root of 49173989 is about 7012.4167731247. The cubic root of 49173989 is about 366.3631743029.

The spelling of 49173989 in words is "forty-nine million, one hundred seventy-three thousand, nine hundred eighty-nine".