251420245 has 16 divisors (see below), whose sum is σ = 316229760. Its totient is φ = 191530944.

The previous prime is 251420243. The next prime is 251420263. The reversal of 251420245 is 542024152.

It is a cyclic number.

It is not a de Polignac number, because 251420245 - 2¹ = 251420243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251420243) 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, 21562 + ... + 31108.

It is an arithmetic number, because the mean of its divisors is an integer number (19764360).

Almost surely, 2^251420245 is an apocalyptic number.

It is an amenable number.

251420245 is a deficient number, since it is larger than the sum of its proper divisors (64809515).

251420245 is a wasteful number, since it uses less digits than its factorization.

251420245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9804.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 251420245 is about 15856.2367855680. The cubic root of 251420245 is about 631.1512040921.

Adding to 251420245 its reverse (542024152), we get a palindrome (793444397).

The spelling of 251420245 in words is "two hundred fifty-one million, four hundred twenty thousand, two hundred forty-five".