42251431 has 4 divisors (see below), whose sum is σ = 42669864. Its totient is φ = 41833000.

The previous prime is 42251423. The next prime is 42251453. The reversal of 42251431 is 13415224.

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

It is a cyclic number.

It is not a de Polignac number, because 42251431 - 2³ = 42251423 is a prime.

It is a super-2 number, since 2×42251431² = 3570366843095522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42251401) 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, 209065 + ... + 209266.

It is an arithmetic number, because the mean of its divisors is an integer number (10667466).

Almost surely, 2^42251431 is an apocalyptic number.

42251431 is a deficient number, since it is larger than the sum of its proper divisors (418433).

42251431 is a wasteful number, since it uses less digits than its factorization.

42251431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418432.

The product of its digits is 960, while the sum is 22.

The square root of 42251431 is about 6500.1100759910. The cubic root of 42251431 is about 348.2949205344.

Adding to 42251431 its reverse (13415224), we get a palindrome (55666655).

The spelling of 42251431 in words is "forty-two million, two hundred fifty-one thousand, four hundred thirty-one".