82111251 has 12 divisors (see below), whose sum is σ = 112526232. Its totient is φ = 53258688.

The previous prime is 82111231. The next prime is 82111259. The reversal of 82111251 is 15211128.

It is not a de Polignac number, because 82111251 - 2⁶ = 82111187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82111259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5890 + ... + 14103.

It is an arithmetic number, because the mean of its divisors is an integer number (9377186).

Almost surely, 2^82111251 is an apocalyptic number.

82111251 is a deficient number, since it is larger than the sum of its proper divisors (30414981).

82111251 is a wasteful number, since it uses less digits than its factorization.

82111251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20070 (or 20033 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

The square root of 82111251 is about 9061.5258648861. The cubic root of 82111251 is about 434.6445345501.

Adding to 82111251 its reverse (15211128), we get a palindrome (97322379).

The spelling of 82111251 in words is "eighty-two million, one hundred eleven thousand, two hundred fifty-one".