249749451 has 12 divisors (see below), whose sum is σ = 412284912. Its totient is φ = 142713936.

The previous prime is 249749441. The next prime is 249749453. The reversal of 249749451 is 154947942.

249749451 is a `hidden beast` number, since 24 + 97 + 494 + 51 = 666.

It is not a de Polignac number, because 249749451 - 2¹⁵ = 249716683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249749397 and 249749406.

It is not an unprimeable number, because it can be changed into a prime (249749453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1982076 + ... + 1982201.

It is an arithmetic number, because the mean of its divisors is an integer number (34357076).

Almost surely, 2^249749451 is an apocalyptic number.

249749451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

249749451 is a deficient number, since it is larger than the sum of its proper divisors (162535461).

249749451 is a wasteful number, since it uses less digits than its factorization.

249749451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964290 (or 3964287 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 249749451 is about 15803.4632596782. The cubic root of 249749451 is about 629.7500066321.

It can be divided in two parts, 249 and 749451, that added together give a triangular number (749700 = T₁₂₂₄).

The spelling of 249749451 in words is "two hundred forty-nine million, seven hundred forty-nine thousand, four hundred fifty-one".