40121663 has 2 divisors, whose sum is σ = 40121664. Its totient is φ = 40121662.

The previous prime is 40121639. The next prime is 40121681. The reversal of 40121663 is 36612104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40121663 - 2¹⁴ = 40105279 is a prime.

It is a Chen prime.

It is equal to p_2440625 and since 40121663 and 2440625 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40121633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060831 + 20060832.

It is an arithmetic number, because the mean of its divisors is an integer number (20060832).

Almost surely, 2^40121663 is an apocalyptic number.

40121663 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121663 is an equidigital number, since it uses as much as digits as its factorization.

40121663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40121663 is about 6334.1663224137. The cubic root of 40121663 is about 342.3415730610.

Adding to 40121663 its reverse (36612104), we get a palindrome (76733767).

The spelling of 40121663 in words is "forty million, one hundred twenty-one thousand, six hundred sixty-three".