81219283 has 2 divisors, whose sum is σ = 81219284. Its totient is φ = 81219282.

The previous prime is 81219253. The next prime is 81219293. The reversal of 81219283 is 38291218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81219283 - 2⁹ = 81218771 is a prime.

It is not a weakly prime, because it can be changed into another prime (81219253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40609641 + 40609642.

It is an arithmetic number, because the mean of its divisors is an integer number (40609642).

Almost surely, 2^81219283 is an apocalyptic number.

81219283 is a deficient number, since it is larger than the sum of its proper divisors (1).

81219283 is an equidigital number, since it uses as much as digits as its factorization.

81219283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 81219283 is about 9012.1741549972. The cubic root of 81219283 is about 433.0649647311.

The spelling of 81219283 in words is "eighty-one million, two hundred nineteen thousand, two hundred eighty-three".