40409101 has 2 divisors, whose sum is σ = 40409102. Its totient is φ = 40409100.

The previous prime is 40409087. The next prime is 40409113. The reversal of 40409101 is 10190404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36893476 + 3515625 = 6074^2 + 1875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40409101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40409141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20204550 + 20204551.

It is an arithmetic number, because the mean of its divisors is an integer number (20204551).

Almost surely, 2^40409101 is an apocalyptic number.

It is an amenable number.

40409101 is a deficient number, since it is larger than the sum of its proper divisors (1).

40409101 is an equidigital number, since it uses as much as digits as its factorization.

40409101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 40409101 is about 6356.8153190100. The cubic root of 40409101 is about 343.1571583867.

Adding to 40409101 its reverse (10190404), we get a palindrome (50599505).

The spelling of 40409101 in words is "forty million, four hundred nine thousand, one hundred one".