42137431 has 4 divisors (see below), whose sum is σ = 48157072. Its totient is φ = 36117792.

The previous prime is 42137429. The next prime is 42137443. The reversal of 42137431 is 13473124.

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 42137431 - 2¹ = 42137429 is a prime.

It is a super-2 number, since 2×42137431² = 3551126182559522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42137396 and 42137405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42137131) 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, 3009810 + ... + 3009823.

It is an arithmetic number, because the mean of its divisors is an integer number (12039268).

Almost surely, 2^42137431 is an apocalyptic number.

42137431 is a deficient number, since it is larger than the sum of its proper divisors (6019641).

42137431 is an equidigital number, since it uses as much as digits as its factorization.

42137431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6019640.

The product of its digits is 2016, while the sum is 25.

The square root of 42137431 is about 6491.3350706923. The cubic root of 42137431 is about 347.9813896552.

The spelling of 42137431 in words is "forty-two million, one hundred thirty-seven thousand, four hundred thirty-one".