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102808451 = 293545119
BaseRepresentation
bin1100010000010…
…11101110000011
321011110012200102
412020023232003
5202304332301
614111313015
72355600044
oct610135603
9234405612
10102808451
115303a569
122a51b76b
13183b7c05
14d9228cb
15905bb6b
hex620bb83

102808451 has 4 divisors (see below), whose sum is σ = 106353600. Its totient is φ = 99263304.

The previous prime is 102808441. The next prime is 102808483. The reversal of 102808451 is 154808201.

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 102808451 - 210 = 102807427 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 3545119 = 102808451 / (1 + 0 + 2 + 8 + 0 + 8 + 4 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102808441) 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, 1772531 + ... + 1772588.

It is an arithmetic number, because the mean of its divisors is an integer number (26588400).

Almost surely, 2102808451 is an apocalyptic number.

102808451 is the 4535-th centered decagonal number.

102808451 is a deficient number, since it is larger than the sum of its proper divisors (3545149).

102808451 is an equidigital number, since it uses as much as digits as its factorization.

102808451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545148.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 102808451 is about 10139.4502316447. The cubic root of 102808451 is about 468.4640534900.

The spelling of 102808451 in words is "one hundred two million, eight hundred eight thousand, four hundred fifty-one".

Divisors: 1 29 3545119 102808451