40000029999991 has 2 divisors, whose sum is σ = 40000029999992. Its totient is φ = 40000029999990.

The previous prime is 40000029999983. The next prime is 40000030000037. The reversal of 40000029999991 is 19999992000004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40000029999991 - 2³ = 40000029999983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40000029999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000014999995 + 20000014999996.

It is an arithmetic number, because the mean of its divisors is an integer number (20000014999996).

Almost surely, 2^{40000029999991} is an apocalyptic number.

40000029999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40000029999991 is an equidigital number, since it uses as much as digits as its factorization.

40000029999991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4251528, while the sum is 61.

The spelling of 40000029999991 in words is "forty trillion, twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".