40128472291 has 2 divisors, whose sum is σ = 40128472292. Its totient is φ = 40128472290.

The previous prime is 40128472289. The next prime is 40128472339. The reversal of 40128472291 is 19227482104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40128472291 - 2¹ = 40128472289 is a prime.

It is a super-2 number, since 2×40128472291² (a number of 22 digits) contains 22 as substring.

Together with 40128472289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40128472261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064236145 + 20064236146.

It is an arithmetic number, because the mean of its divisors is an integer number (20064236146).

Almost surely, 2^40128472291 is an apocalyptic number.

40128472291 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128472291 is an equidigital number, since it uses as much as digits as its factorization.

40128472291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 40128472291 in words is "forty billion, one hundred twenty-eight million, four hundred seventy-two thousand, two hundred ninety-one".