81219431462363 has 2 divisors, whose sum is σ = 81219431462364. Its totient is φ = 81219431462362.

The previous prime is 81219431462359. The next prime is 81219431462431. The reversal of 81219431462363 is 36326413491218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81219431462363 - 2² = 81219431462359 is a prime.

It is not a weakly prime, because it can be changed into another prime (81219431662363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40609715731181 + 40609715731182.

It is an arithmetic number, because the mean of its divisors is an integer number (40609715731182).

Almost surely, 2^{81219431462363} is an apocalyptic number.

81219431462363 is a deficient number, since it is larger than the sum of its proper divisors (1).

81219431462363 is an equidigital number, since it uses as much as digits as its factorization.

81219431462363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 53.

The spelling of 81219431462363 in words is "eighty-one trillion, two hundred nineteen billion, four hundred thirty-one million, four hundred sixty-two thousand, three hundred sixty-three".