40188251 has 2 divisors, whose sum is σ = 40188252. Its totient is φ = 40188250.

The previous prime is 40188233. The next prime is 40188271. The reversal of 40188251 is 15288104.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40188251 is a prime.

It is not a weakly prime, because it can be changed into another prime (40188271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20094125 + 20094126.

It is an arithmetic number, because the mean of its divisors is an integer number (20094126).

Almost surely, 2^40188251 is an apocalyptic number.

40188251 is a deficient number, since it is larger than the sum of its proper divisors (1).

40188251 is an equidigital number, since it uses as much as digits as its factorization.

40188251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 40188251 is about 6339.4203993741. The cubic root of 40188251 is about 342.5308576812.

The spelling of 40188251 in words is "forty million, one hundred eighty-eight thousand, two hundred fifty-one".