249473617 has 4 divisors (see below), whose sum is σ = 260320320. Its totient is φ = 238626916.

The previous prime is 249473579. The next prime is 249473633. The reversal of 249473617 is 716374942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716374942 = 2 ⋅358187471.

It is a cyclic number.

It is not a de Polignac number, because 249473617 - 2⁷ = 249473489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249473677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5423317 + ... + 5423362.

It is an arithmetic number, because the mean of its divisors is an integer number (65080080).

Almost surely, 2^249473617 is an apocalyptic number.

It is an amenable number.

249473617 is a deficient number, since it is larger than the sum of its proper divisors (10846703).

249473617 is a wasteful number, since it uses less digits than its factorization.

249473617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10846702.

The product of its digits is 254016, while the sum is 43.

The square root of 249473617 is about 15794.7338375802. The cubic root of 249473617 is about 629.5180802602.

The spelling of 249473617 in words is "two hundred forty-nine million, four hundred seventy-three thousand, six hundred seventeen".