81933623 has 2 divisors, whose sum is σ = 81933624. Its totient is φ = 81933622.

The previous prime is 81933583. The next prime is 81933629. The reversal of 81933623 is 32633918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81933623 - 2²⁴ = 65156407 is a prime.

It is a super-2 number, since 2×81933623² = 13426237155812258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81933629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40966811 + 40966812.

It is an arithmetic number, because the mean of its divisors is an integer number (40966812).

Almost surely, 2^81933623 is an apocalyptic number.

81933623 is a deficient number, since it is larger than the sum of its proper divisors (1).

81933623 is an equidigital number, since it uses as much as digits as its factorization.

81933623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 81933623 is about 9051.7193394404. The cubic root of 81933623 is about 434.3308918724.

The spelling of 81933623 in words is "eighty-one million, nine hundred thirty-three thousand, six hundred twenty-three".