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81629 is a prime number
BaseRepresentation
bin10011111011011101
311010222022
4103323131
510103004
61425525
7456662
oct237335
9133868
1081629
1156369
123b2a5
132b202
1421a69
15192be
hex13edd

81629 has 2 divisors, whose sum is σ = 81630. Its totient is φ = 81628.

The previous prime is 81619. The next prime is 81637. The reversal of 81629 is 92618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76729 + 4900 = 277^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 81629 - 28 = 81373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81598 and 81607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40814 + 40815.

It is an arithmetic number, because the mean of its divisors is an integer number (40815).

281629 is an apocalyptic number.

It is an amenable number.

81629 is a deficient number, since it is larger than the sum of its proper divisors (1).

81629 is an equidigital number, since it uses as much as digits as its factorization.

81629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 81629 is about 285.7078927856. The cubic root of 81629 is about 43.3791953631.

The spelling of 81629 in words is "eighty-one thousand, six hundred twenty-nine".