251442434 has 4 divisors (see below), whose sum is σ = 377163654. Its totient is φ = 125721216.

The previous prime is 251442431. The next prime is 251442449. The reversal of 251442434 is 434244152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 165045409 + 86397025 = 12847^2 + 9295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251442397 and 251442406.

It is not an unprimeable number, because it can be changed into a prime (251442431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62860607 + ... + 62860610.

Almost surely, 2^251442434 is an apocalyptic number.

251442434 is a deficient number, since it is larger than the sum of its proper divisors (125721220).

251442434 is a wasteful number, since it uses less digits than its factorization.

251442434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125721219.

The product of its digits is 15360, while the sum is 29.

The square root of 251442434 is about 15856.9364632643. The cubic root of 251442434 is about 631.1697708839.

Adding to 251442434 its reverse (434244152), we get a palindrome (685686586).

The spelling of 251442434 in words is "two hundred fifty-one million, four hundred forty-two thousand, four hundred thirty-four".