42512251 has 8 divisors (see below), whose sum is σ = 43838784. Its totient is φ = 41201160.

The previous prime is 42512219. The next prime is 42512269. The reversal of 42512251 is 15221524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42512251 - 2⁵ = 42512219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42512551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860 + ... + 9406.

It is an arithmetic number, because the mean of its divisors is an integer number (5479848).

Almost surely, 2^42512251 is an apocalyptic number.

42512251 is a deficient number, since it is larger than the sum of its proper divisors (1326533).

42512251 is a wasteful number, since it uses less digits than its factorization.

42512251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7721.

The product of its digits is 800, while the sum is 22.

The square root of 42512251 is about 6520.1419463076. The cubic root of 42512251 is about 349.0101309856.

Adding to 42512251 its reverse (15221524), we get a palindrome (57733775).

The spelling of 42512251 in words is "forty-two million, five hundred twelve thousand, two hundred fifty-one".