42125431 has 2 divisors, whose sum is σ = 42125432. Its totient is φ = 42125430.

The previous prime is 42125393. The next prime is 42125437. The reversal of 42125431 is 13452124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42125431 - 2¹³ = 42117239 is a prime.

It is a super-2 number, since 2×42125431² = 3549103873871522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42125437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21062715 + 21062716.

It is an arithmetic number, because the mean of its divisors is an integer number (21062716).

Almost surely, 2^42125431 is an apocalyptic number.

42125431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42125431 is an equidigital number, since it uses as much as digits as its factorization.

42125431 is an evil number, because the sum of its binary digits is even.

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

The square root of 42125431 is about 6490.4106957881. The cubic root of 42125431 is about 347.9483535237.

Adding to 42125431 its reverse (13452124), we get a palindrome (55577555).

It can be divided in two parts, 421 and 25431, that added together give a palindrome (25852).

The spelling of 42125431 in words is "forty-two million, one hundred twenty-five thousand, four hundred thirty-one".