40090901 has 2 divisors, whose sum is σ = 40090902. Its totient is φ = 40090900.

The previous prime is 40090889. The next prime is 40090903. The reversal of 40090901 is 10909004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31651876 + 8439025 = 5626^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 40090901 - 2⁶ = 40090837 is a prime.

Together with 40090903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40090903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20045450 + 20045451.

It is an arithmetic number, because the mean of its divisors is an integer number (20045451).

Almost surely, 2^40090901 is an apocalyptic number.

It is an amenable number.

40090901 is a deficient number, since it is larger than the sum of its proper divisors (1).

40090901 is an equidigital number, since it uses as much as digits as its factorization.

40090901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 40090901 is about 6331.7375972161. The cubic root of 40090901 is about 342.2540575453.

Adding to 40090901 its reverse (10909004), we get a palindrome (50999905).

The spelling of 40090901 in words is "forty million, ninety thousand, nine hundred one".