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56689999 is a prime number
BaseRepresentation
bin1101100001000…
…0010101001111
310221200011001121
43120100111033
5104003034444
65343021411
71255566652
oct330202517
9127604047
1056689999
112a000043
1216b9a867
13b98b4a2
147759899
154e9c084
hex361054f

56689999 has 2 divisors, whose sum is σ = 56690000. Its totient is φ = 56689998.

The previous prime is 56689993. The next prime is 56690017. The reversal of 56689999 is 99998665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56689999 - 25 = 56689967 is a prime.

56689999 is a modest number, since divided by 9999 gives 5668 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56689993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28344999 + 28345000.

It is an arithmetic number, because the mean of its divisors is an integer number (28345000).

Almost surely, 256689999 is an apocalyptic number.

56689999 is a deficient number, since it is larger than the sum of its proper divisors (1).

56689999 is an equidigital number, since it uses as much as digits as its factorization.

56689999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 61.

The square root of 56689999 is about 7529.2761272250. The cubic root of 56689999 is about 384.1511607391.

The spelling of 56689999 in words is "fifty-six million, six hundred eighty-nine thousand, nine hundred ninety-nine".