42132781 has 2 divisors, whose sum is σ = 42132782. Its totient is φ = 42132780.

The previous prime is 42132773. The next prime is 42132791. The reversal of 42132781 is 18723124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27730756 + 14402025 = 5266^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 42132781 - 2³ = 42132773 is a prime.

It is a super-2 number, since 2×42132781² = 3550342469587922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42132791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21066390 + 21066391.

It is an arithmetic number, because the mean of its divisors is an integer number (21066391).

Almost surely, 2^42132781 is an apocalyptic number.

It is an amenable number.

42132781 is a deficient number, since it is larger than the sum of its proper divisors (1).

42132781 is an equidigital number, since it uses as much as digits as its factorization.

42132781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 42132781 is about 6490.9768910388. The cubic root of 42132781 is about 347.9685888987.

The spelling of 42132781 in words is "forty-two million, one hundred thirty-two thousand, seven hundred eighty-one".