82155631 has 2 divisors, whose sum is σ = 82155632. Its totient is φ = 82155630.

The previous prime is 82155617. The next prime is 82155643. The reversal of 82155631 is 13655128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82155631 - 2⁵ = 82155599 is a prime.

It is a super-2 number, since 2×82155631² = 13499095410016322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82155593 and 82155602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82155691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41077815 + 41077816.

It is an arithmetic number, because the mean of its divisors is an integer number (41077816).

Almost surely, 2^82155631 is an apocalyptic number.

82155631 is a deficient number, since it is larger than the sum of its proper divisors (1).

82155631 is an equidigital number, since it uses as much as digits as its factorization.

82155631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 82155631 is about 9063.9743490370. The cubic root of 82155631 is about 434.7228269076.

The spelling of 82155631 in words is "eighty-two million, one hundred fifty-five thousand, six hundred thirty-one".