249147481 has 4 divisors (see below), whose sum is σ = 271797264. Its totient is φ = 226497700.

The previous prime is 249147463. The next prime is 249147511. The reversal of 249147481 is 184741942.

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.

It is not a de Polignac number, because 249147481 - 2²¹ = 247050329 is a prime.

It is a super-2 number, since 2×249147481² = 124148934577290722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249147781) 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, 11324875 + ... + 11324896.

It is an arithmetic number, because the mean of its divisors is an integer number (67949316).

Almost surely, 2^249147481 is an apocalyptic number.

It is an amenable number.

249147481 is a deficient number, since it is larger than the sum of its proper divisors (22649783).

249147481 is a wasteful number, since it uses less digits than its factorization.

249147481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22649782.

The product of its digits is 64512, while the sum is 40.

The square root of 249147481 is about 15784.4062606105. The cubic root of 249147481 is about 629.2436383606.

The spelling of 249147481 in words is "two hundred forty-nine million, one hundred forty-seven thousand, four hundred eighty-one".