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999161857 is a prime number
BaseRepresentation
bin111011100011100…
…000000000000001
32120122002200101201
4323203200000001
54021241134412
6243051301201
733521510221
oct7343400001
92518080351
10999161857
11473001101
1223a74a801
1312c005845
14969b0081
155cab7e57
hex3b8e0001

999161857 has 2 divisors, whose sum is σ = 999161858. Its totient is φ = 999161856.

The previous prime is 999161843. The next prime is 999161879. The reversal of 999161857 is 758161999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787139136 + 212022721 = 28056^2 + 14561^2 .

It is a cyclic number.

It is not a de Polignac number, because 999161857 - 27 = 999161729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999161798 and 999161807.

It is not a weakly prime, because it can be changed into another prime (999161887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499580928 + 499580929.

It is an arithmetic number, because the mean of its divisors is an integer number (499580929).

It is a Proth number, since it is equal to 7623 ⋅ 217 + 1 and 7623 < 217.

Almost surely, 2999161857 is an apocalyptic number.

It is an amenable number.

999161857 is a deficient number, since it is larger than the sum of its proper divisors (1).

999161857 is an equidigital number, since it uses as much as digits as its factorization.

999161857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 55.

The square root of 999161857 is about 31609.5216192843. The cubic root of 999161857 is about 999.7205409099.

The spelling of 999161857 in words is "nine hundred ninety-nine million, one hundred sixty-one thousand, eight hundred fifty-seven".