40401123281 has 2 divisors, whose sum is σ = 40401123282. Its totient is φ = 40401123280.

The previous prime is 40401123227. The next prime is 40401123283. The reversal of 40401123281 is 18232110404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22226039056 + 18175084225 = 149084^2 + 134815^2 .

It is a cyclic number.

It is not a de Polignac number, because 40401123281 - 2¹⁰ = 40401122257 is a prime.

It is a super-2 number, since 2×40401123281² (a number of 22 digits) contains 22 as substring.

Together with 40401123283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40401123281.

It is not a weakly prime, because it can be changed into another prime (40401123283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200561640 + 20200561641.

It is an arithmetic number, because the mean of its divisors is an integer number (20200561641).

Almost surely, 2^40401123281 is an apocalyptic number.

It is an amenable number.

40401123281 is a deficient number, since it is larger than the sum of its proper divisors (1).

40401123281 is an equidigital number, since it uses as much as digits as its factorization.

40401123281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 40401123281 its reverse (18232110404), we get a palindrome (58633233685).

The spelling of 40401123281 in words is "forty billion, four hundred one million, one hundred twenty-three thousand, two hundred eighty-one".