40991311 has 2 divisors, whose sum is σ = 40991312. Its totient is φ = 40991310.

The previous prime is 40991299. The next prime is 40991323. The reversal of 40991311 is 11319904.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (40991299) and next prime (40991323).

It is a cyclic number.

It is not a de Polignac number, because 40991311 - 2⁷ = 40991183 is a prime.

It is equal to p_2490274 and since 40991311 and 2490274 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40991311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40991351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20495655 + 20495656.

It is an arithmetic number, because the mean of its divisors is an integer number (20495656).

Almost surely, 2^40991311 is an apocalyptic number.

40991311 is a deficient number, since it is larger than the sum of its proper divisors (1).

40991311 is an equidigital number, since it uses as much as digits as its factorization.

40991311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 40991311 is about 6402.4457045726. The cubic root of 40991311 is about 344.7973633257.

The spelling of 40991311 in words is "forty million, nine hundred ninety-one thousand, three hundred eleven".