42272431 has 2 divisors, whose sum is σ = 42272432. Its totient is φ = 42272430.

The previous prime is 42272423. The next prime is 42272443. The reversal of 42272431 is 13427224.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42272431 - 2³ = 42272423 is a prime.

It is a super-2 number, since 2×42272431² = 3573916845299522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42272396 and 42272405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42272471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21136215 + 21136216.

It is an arithmetic number, because the mean of its divisors is an integer number (21136216).

Almost surely, 2^42272431 is an apocalyptic number.

42272431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42272431 is an equidigital number, since it uses as much as digits as its factorization.

42272431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 25.

The square root of 42272431 is about 6501.7252325825. The cubic root of 42272431 is about 348.3526146899.

Adding to 42272431 its reverse (13427224), we get a palindrome (55699655).

The spelling of 42272431 in words is "forty-two million, two hundred seventy-two thousand, four hundred thirty-one".