42115251 has 8 divisors (see below), whose sum is σ = 56439504. Its totient is φ = 27933920.

The previous prime is 42115237. The next prime is 42115253. The reversal of 42115251 is 15251124.

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 42115251 - 2⁵ = 42115219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42115253) 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, 35040 + ... + 36221.

It is an arithmetic number, because the mean of its divisors is an integer number (7054938).

Almost surely, 2^42115251 is an apocalyptic number.

42115251 is a deficient number, since it is larger than the sum of its proper divisors (14324253).

42115251 is a wasteful number, since it uses less digits than its factorization.

42115251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71461.

The product of its digits is 400, while the sum is 21.

The square root of 42115251 is about 6489.6264145172. The cubic root of 42115251 is about 347.9203229531.

Adding to 42115251 its reverse (15251124), we get a palindrome (57366375).

The spelling of 42115251 in words is "forty-two million, one hundred fifteen thousand, two hundred fifty-one".