82101251 has 4 divisors (see below), whose sum is σ = 82121232. Its totient is φ = 82081272.

The previous prime is 82101247. The next prime is 82101269. The reversal of 82101251 is 15210128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82101251 - 2² = 82101247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82104251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316 + ... + 12881.

It is an arithmetic number, because the mean of its divisors is an integer number (20530308).

Almost surely, 2^82101251 is an apocalyptic number.

82101251 is a deficient number, since it is larger than the sum of its proper divisors (19981).

82101251 is a wasteful number, since it uses less digits than its factorization.

82101251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19980.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 82101251 is about 9060.9740646357. The cubic root of 82101251 is about 434.6268892955.

Adding to 82101251 its reverse (15210128), we get a palindrome (97311379).

The spelling of 82101251 in words is "eighty-two million, one hundred one thousand, two hundred fifty-one".