42031251 has 16 divisors (see below), whose sum is σ = 62889120. Its totient is φ = 27741600.

The previous prime is 42031243. The next prime is 42031267. The reversal of 42031251 is 15213024.

It is not a de Polignac number, because 42031251 - 2³ = 42031243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42031201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4980 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (3930570).

Almost surely, 2^42031251 is an apocalyptic number.

42031251 is a deficient number, since it is larger than the sum of its proper divisors (20857869).

42031251 is a wasteful number, since it uses less digits than its factorization.

42031251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15523 (or 15517 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42031251 is about 6483.1513170680. The cubic root of 42031251 is about 347.6888568515.

Adding to 42031251 its reverse (15213024), we get a palindrome (57244275).

The spelling of 42031251 in words is "forty-two million, thirty-one thousand, two hundred fifty-one".