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BaseRepresentation
bin101100001010…
…1001010000011
31121120102010212
41120111022003
521411432311
62144144335
7400550153
oct130251203
947512125
1023155331
1112085a41
1279080ab
134a496a4
14310a763
152075c8b
hex1615283

23155331 has 2 divisors, whose sum is σ = 23155332. Its totient is φ = 23155330.

The previous prime is 23155313. The next prime is 23155333. The reversal of 23155331 is 13355132.

Together with previous prime (23155313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-23155331 is a prime.

It is a super-2 number, since 2×231553312 = 1072338707439122, which contains 22 as substring.

Together with 23155333, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23155297 and 23155306.

It is not a weakly prime, because it can be changed into another prime (23155333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11577665 + 11577666.

It is an arithmetic number, because the mean of its divisors is an integer number (11577666).

Almost surely, 223155331 is an apocalyptic number.

23155331 is a deficient number, since it is larger than the sum of its proper divisors (1).

23155331 is an equidigital number, since it uses as much as digits as its factorization.

23155331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 23.

The square root of 23155331 is about 4811.9986492101. The cubic root of 23155331 is about 285.0254660737.

The spelling of 23155331 in words is "twenty-three million, one hundred fifty-five thousand, three hundred thirty-one".