42571251 has 10 divisors (see below), whose sum is σ = 63594212. Its totient is φ = 28380780.

The previous prime is 42571241. The next prime is 42571259. The reversal of 42571251 is 15217524.

42571251 is a `hidden beast` number, since 42 + 571 + 2 + 51 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-42571251 is a prime.

It is a super-2 number, since 2×42571251² = 3624622823410002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42571259) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 262705 + ... + 262866.

Almost surely, 2^42571251 is an apocalyptic number.

42571251 is a deficient number, since it is larger than the sum of its proper divisors (21022961).

42571251 is an equidigital number, since it uses as much as digits as its factorization.

42571251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525583 (or 525574 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 42571251 is about 6524.6648189773. The cubic root of 42571251 is about 349.1715125377.

Adding to 42571251 its reverse (15217524), we get a palindrome (57788775).

The spelling of 42571251 in words is "forty-two million, five hundred seventy-one thousand, two hundred fifty-one".