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BaseRepresentation
bin11110011101
32200012
4132131
530244
613005
75453
oct3635
92605
101949
111512
121165
13b6c
149d3
1589e
hex79d

1949 has 2 divisors, whose sum is σ = 1950. Its totient is φ = 1948.

The previous prime is 1933. The next prime is 1951. The reversal of 1949 is 9491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1849 + 100 = 43^2 + 10^2 .

It is an emirp because it is prime and its reverse (9491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949 - 24 = 1933 is a prime.

Together with 1951, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974 + 975.

It is an arithmetic number, because the mean of its divisors is an integer number (975).

It is an amenable number.

1949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949 is an equidigital number, since it uses as much as digits as its factorization.

1949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 1949 is about 44.1474801093. The cubic root of 1949 is about 12.4911937975.

The spelling of 1949 in words is "one thousand, nine hundred forty-nine".