40191601 has 2 divisors, whose sum is σ = 40191602. Its totient is φ = 40191600.

The previous prime is 40191589. The next prime is 40191611. The reversal of 40191601 is 10619104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 17007376 = 4815^2 + 4124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40191601 is a prime.

It is equal to p_2444602 and since 40191601 and 2444602 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40191611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20095800 + 20095801.

It is an arithmetic number, because the mean of its divisors is an integer number (20095801).

Almost surely, 2^40191601 is an apocalyptic number.

It is an amenable number.

40191601 is a deficient number, since it is larger than the sum of its proper divisors (1).

40191601 is an equidigital number, since it uses as much as digits as its factorization.

40191601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 40191601 is about 6339.6846136066. The cubic root of 40191601 is about 342.5403749444.

The spelling of 40191601 in words is "forty million, one hundred ninety-one thousand, six hundred one".