249147479 has 4 divisors (see below), whose sum is σ = 284739984. Its totient is φ = 213554976.

The previous prime is 249147463. The next prime is 249147511. The reversal of 249147479 is 974741942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249147479 - 2⁴ = 249147463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249147079) 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, 17796242 + ... + 17796255.

It is an arithmetic number, because the mean of its divisors is an integer number (71184996).

Almost surely, 2^249147479 is an apocalyptic number.

249147479 is a deficient number, since it is larger than the sum of its proper divisors (35592505).

249147479 is an equidigital number, since it uses as much as digits as its factorization.

249147479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35592504.

The product of its digits is 508032, while the sum is 47.

The square root of 249147479 is about 15784.4061972568. The cubic root of 249147479 is about 629.2436366769.

The spelling of 249147479 in words is "two hundred forty-nine million, one hundred forty-seven thousand, four hundred seventy-nine".