251530129 has 4 divisors (see below), whose sum is σ = 251662320. Its totient is φ = 251397940.

The previous prime is 251530099. The next prime is 251530163. The reversal of 251530129 is 921035152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251530129 - 2¹³ = 251521937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251530097 and 251530106.

It is not an unprimeable number, because it can be changed into a prime (251530199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63199 + ... + 67060.

It is an arithmetic number, because the mean of its divisors is an integer number (62915580).

Almost surely, 2^251530129 is an apocalyptic number.

It is an amenable number.

251530129 is a deficient number, since it is larger than the sum of its proper divisors (132191).

251530129 is a wasteful number, since it uses less digits than its factorization.

251530129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132190.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 251530129 is about 15859.7014158527. The cubic root of 251530129 is about 631.2431395653.

The spelling of 251530129 in words is "two hundred fifty-one million, five hundred thirty thousand, one hundred twenty-nine".