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18159749 is a prime number
BaseRepresentation
bin100010101000…
…1100010000101
31021011121111022
41011101202011
514122102444
61445120525
7310232606
oct105214205
937147438
1018159749
11a283763
1260b9145
1339ba91a
1425a9dad
1518da9ee
hex1151885

18159749 has 2 divisors, whose sum is σ = 18159750. Its totient is φ = 18159748.

The previous prime is 18159737. The next prime is 18159751. The reversal of 18159749 is 94795181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 6477025 = 3418^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 18159749 - 224 = 1382533 is a prime.

Together with 18159751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18159709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079874 + 9079875.

It is an arithmetic number, because the mean of its divisors is an integer number (9079875).

Almost surely, 218159749 is an apocalyptic number.

It is an amenable number.

18159749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18159749 is an equidigital number, since it uses as much as digits as its factorization.

18159749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 18159749 is about 4261.4257003965. The cubic root of 18159749 is about 262.8471548972.

The spelling of 18159749 in words is "eighteen million, one hundred fifty-nine thousand, seven hundred forty-nine".