81933629 has 2 divisors, whose sum is σ = 81933630. Its totient is φ = 81933628.

The previous prime is 81933623. The next prime is 81933647. The reversal of 81933629 is 92633918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54612100 + 27321529 = 7390^2 + 5227^2 .

It is a cyclic number.

It is not a de Polignac number, because 81933629 - 2²⁰ = 80885053 is a prime.

It is a super-2 number, since 2×81933629² = 13426239122219282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81933623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40966814 + 40966815.

It is an arithmetic number, because the mean of its divisors is an integer number (40966815).

Almost surely, 2^81933629 is an apocalyptic number.

It is an amenable number.

81933629 is a deficient number, since it is larger than the sum of its proper divisors (1).

81933629 is an equidigital number, since it uses as much as digits as its factorization.

81933629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 81933629 is about 9051.7196708692. The cubic root of 81933629 is about 434.3309024744.

The spelling of 81933629 in words is "eighty-one million, nine hundred thirty-three thousand, six hundred twenty-nine".