251271045 has 16 divisors (see below), whose sum is σ = 446704320. Its totient is φ = 134011152.

The previous prime is 251271019. The next prime is 251271047. The reversal of 251271045 is 540172152.

It is not a de Polignac number, because 251271045 - 2⁹ = 251270533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251271047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930499 + ... + 930768.

It is an arithmetic number, because the mean of its divisors is an integer number (27919020).

Almost surely, 2^251271045 is an apocalyptic number.

It is an amenable number.

251271045 is a deficient number, since it is larger than the sum of its proper divisors (195433275).

251271045 is a wasteful number, since it uses less digits than its factorization.

251271045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861281 (or 1861275 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 251271045 is about 15851.5313140403. The cubic root of 251271045 is about 631.0263316326.

The spelling of 251271045 in words is "two hundred fifty-one million, two hundred seventy-one thousand, forty-five".