251438049 has 12 divisors (see below), whose sum is σ = 363418276. Its totient is φ = 167519232.

The previous prime is 251437997. The next prime is 251438053. The reversal of 251438049 is 940834152.

It can be written as a sum of positive squares in 2 ways, for example, as 75690000 + 175748049 = 8700^2 + 13257^2 .

It is a de Polignac number, because none of the positive numbers 2^k-251438049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251438549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7809 + ... + 23745.

Almost surely, 2^251438049 is an apocalyptic number.

It is an amenable number.

251438049 is a deficient number, since it is larger than the sum of its proper divisors (111980227).

251438049 is a wasteful number, since it uses less digits than its factorization.

251438049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17696 (or 17693 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 251438049 is about 15856.7981950960. The cubic root of 251438049 is about 631.1661017929.

The spelling of 251438049 in words is "two hundred fifty-one million, four hundred thirty-eight thousand, forty-nine".