42651281 has 2 divisors, whose sum is σ = 42651282. Its totient is φ = 42651280.

The previous prime is 42651253. The next prime is 42651307. The reversal of 42651281 is 18215624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41731600 + 919681 = 6460^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 42651281 - 2¹⁴ = 42634897 is a prime.

It is a super-2 number, since 2×42651281² = 3638263541881922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42651211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325640 + 21325641.

It is an arithmetic number, because the mean of its divisors is an integer number (21325641).

Almost surely, 2^42651281 is an apocalyptic number.

It is an amenable number.

42651281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651281 is an equidigital number, since it uses as much as digits as its factorization.

42651281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 42651281 is about 6530.7948214593. The cubic root of 42651281 is about 349.3901789141.

The spelling of 42651281 in words is "forty-two million, six hundred fifty-one thousand, two hundred eighty-one".