40203091 has 2 divisors, whose sum is σ = 40203092. Its totient is φ = 40203090.

The previous prime is 40203049. The next prime is 40203101. The reversal of 40203091 is 19030204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40203091 - 2¹¹ = 40201043 is a prime.

It is not a weakly prime, because it can be changed into another prime (40203041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20101545 + 20101546.

It is an arithmetic number, because the mean of its divisors is an integer number (20101546).

Almost surely, 2^40203091 is an apocalyptic number.

40203091 is a deficient number, since it is larger than the sum of its proper divisors (1).

40203091 is an equidigital number, since it uses as much as digits as its factorization.

40203091 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 19.

The square root of 40203091 is about 6340.5907453486. The cubic root of 40203091 is about 342.5730137198.

Adding to 40203091 its reverse (19030204), we get a palindrome (59233295).

The spelling of 40203091 in words is "forty million, two hundred three thousand, ninety-one".