42453181 has 2 divisors, whose sum is σ = 42453182. Its totient is φ = 42453180.

The previous prime is 42453157. The next prime is 42453221. The reversal of 42453181 is 18135424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30140100 + 12313081 = 5490^2 + 3509^2 .

It is a cyclic number.

It is not a de Polignac number, because 42453181 - 2¹³ = 42444989 is a prime.

It is a super-2 number, since 2×42453181² = 3604545154037522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42453121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21226590 + 21226591.

It is an arithmetic number, because the mean of its divisors is an integer number (21226591).

Almost surely, 2^42453181 is an apocalyptic number.

It is an amenable number.

42453181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42453181 is an equidigital number, since it uses as much as digits as its factorization.

42453181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 42453181 is about 6515.6105623341. The cubic root of 42453181 is about 348.8484083146.

The spelling of 42453181 in words is "forty-two million, four hundred fifty-three thousand, one hundred eighty-one".