251252530145 has 16 divisors (see below), whose sum is σ = 302115381120. Its totient is φ = 200594198784.

The previous prime is 251252530129. The next prime is 251252530147. The reversal of 251252530145 is 541035252152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 251252530145 - 2⁴ = 251252530129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251252530147) 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, 5156537 + ... + 5205033.

It is an arithmetic number, because the mean of its divisors is an integer number (18882211320).

Almost surely, 2^251252530145 is an apocalyptic number.

It is an amenable number.

251252530145 is a deficient number, since it is larger than the sum of its proper divisors (50862850975).

251252530145 is a wasteful number, since it uses less digits than its factorization.

251252530145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50584.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 251252530145 its reverse (541035252152), we get a palindrome (792287782297).

The spelling of 251252530145 in words is "two hundred fifty-one billion, two hundred fifty-two million, five hundred thirty thousand, one hundred forty-five".