42051251 has 12 divisors (see below), whose sum is σ = 48942936. Its totient is φ = 35977920.

The previous prime is 42051239. The next prime is 42051271. The reversal of 42051251 is 15215024.

It is not a de Polignac number, because 42051251 - 2¹⁰ = 42050227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42051211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8165 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (4078578).

Almost surely, 2^42051251 is an apocalyptic number.

42051251 is a deficient number, since it is larger than the sum of its proper divisors (6891685).

42051251 is a wasteful number, since it uses less digits than its factorization.

42051251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20482 (or 20471 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42051251 is about 6484.6935933782. The cubic root of 42051251 is about 347.7439957803.

Adding to 42051251 its reverse (15215024), we get a palindrome (57266275).

The spelling of 42051251 in words is "forty-two million, fifty-one thousand, two hundred fifty-one".