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2128831 is a prime number
BaseRepresentation
bin1000000111101110111111
311000011012121
420013232333
51021110311
6113343411
724044335
oct10075677
94004177
102128831
111224471
12867b67
13596c83
143d5b55
152c0b71
hex207bbf

2128831 has 2 divisors, whose sum is σ = 2128832. Its totient is φ = 2128830.

The previous prime is 2128823. The next prime is 2128837. The reversal of 2128831 is 1388212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2128831 - 23 = 2128823 is a prime.

It is a super-2 number, since 2×21288312 = 9063842853122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2128796 and 2128805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064415 + 1064416.

It is an arithmetic number, because the mean of its divisors is an integer number (1064416).

22128831 is an apocalyptic number.

2128831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128831 is an equidigital number, since it uses as much as digits as its factorization.

2128831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 2128831 is about 1459.0514041664. The cubic root of 2128831 is about 128.6412926002.

The spelling of 2128831 in words is "two million, one hundred twenty-eight thousand, eight hundred thirty-one".