40991322690949 has 2 divisors, whose sum is σ = 40991322690950. Its totient is φ = 40991322690948.

The previous prime is 40991322690883. The next prime is 40991322690979. The reversal of 40991322690949 is 94909622319904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39772484610849 + 1218838080100 = 6306543^2 + 1104010^2 .

It is a cyclic number.

It is not a de Polignac number, because 40991322690949 - 2¹⁷ = 40991322559877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40991322690979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20495661345474 + 20495661345475.

It is an arithmetic number, because the mean of its divisors is an integer number (20495661345475).

Almost surely, 2^{40991322690949} is an apocalyptic number.

It is an amenable number.

40991322690949 is a deficient number, since it is larger than the sum of its proper divisors (1).

40991322690949 is an equidigital number, since it uses as much as digits as its factorization.

40991322690949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68024448, while the sum is 67.

The spelling of 40991322690949 in words is "forty trillion, nine hundred ninety-one billion, three hundred twenty-two million, six hundred ninety thousand, nine hundred forty-nine".