81933097 has 2 divisors, whose sum is σ = 81933098. Its totient is φ = 81933096.

The previous prime is 81933043. The next prime is 81933109. The reversal of 81933097 is 79033918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58079641 + 23853456 = 7621^2 + 4884^2 .

It is a cyclic number.

It is not a de Polignac number, because 81933097 - 2¹⁹ = 81408809 is a prime.

It is a super-2 number, since 2×81933097² = 13426064768022818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81933037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40966548 + 40966549.

It is an arithmetic number, because the mean of its divisors is an integer number (40966549).

Almost surely, 2^81933097 is an apocalyptic number.

It is an amenable number.

81933097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81933097 is an equidigital number, since it uses as much as digits as its factorization.

81933097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 81933097 is about 9051.6902841403. The cubic root of 81933097 is about 434.3299624268.

The spelling of 81933097 in words is "eighty-one million, nine hundred thirty-three thousand, ninety-seven".