102808251 has 32 divisors (see below), whose sum is σ = 187461120. Its totient is φ = 54227232.

The previous prime is 102808247. The next prime is 102808271. The reversal of 102808251 is 152808201.

It is not a de Polignac number, because 102808251 - 2² = 102808247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (102808201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18465 + ... + 23378.

It is an arithmetic number, because the mean of its divisors is an integer number (5858160).

Almost surely, 2^102808251 is an apocalyptic number.

102808251 is a deficient number, since it is larger than the sum of its proper divisors (84652869).

102808251 is a wasteful number, since it uses less digits than its factorization.

102808251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41872 (or 41866 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 102808251 is about 10139.4403691723. The cubic root of 102808251 is about 468.4637497119.

The spelling of 102808251 in words is "one hundred two million, eight hundred eight thousand, two hundred fifty-one".