249172989 has 16 divisors (see below), whose sum is σ = 363854400. Its totient is φ = 150736896.

The previous prime is 249172969. The next prime is 249172993. The reversal of 249172989 is 989271942.

It is not a de Polignac number, because 249172989 - 2⁸ = 249172733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249172909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51844 + ... + 56445.

It is an arithmetic number, because the mean of its divisors is an integer number (22740900).

Almost surely, 2^249172989 is an apocalyptic number.

It is an amenable number.

249172989 is a deficient number, since it is larger than the sum of its proper divisors (114681411).

249172989 is a wasteful number, since it uses less digits than its factorization.

249172989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108364.

The product of its digits is 653184, while the sum is 51.

The square root of 249172989 is about 15785.2142525846. The cubic root of 249172989 is about 629.2651118522.

The spelling of 249172989 in words is "two hundred forty-nine million, one hundred seventy-two thousand, nine hundred eighty-nine".