42493531 has 2 divisors, whose sum is σ = 42493532. Its totient is φ = 42493530.

The previous prime is 42493513. The next prime is 42493543. The reversal of 42493531 is 13539424.

Together with previous prime (42493513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42493531 - 2²³ = 34104923 is a prime.

It is a super-2 number, since 2×42493531² = 3611400353695922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42493493 and 42493502.

It is not a weakly prime, because it can be changed into another prime (42493631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21246765 + 21246766.

It is an arithmetic number, because the mean of its divisors is an integer number (21246766).

Almost surely, 2^42493531 is an apocalyptic number.

42493531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42493531 is an equidigital number, since it uses as much as digits as its factorization.

42493531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 42493531 is about 6518.7062366700. The cubic root of 42493531 is about 348.9588953322.

The spelling of 42493531 in words is "forty-two million, four hundred ninety-three thousand, five hundred thirty-one".