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1375921 is a prime number
BaseRepresentation
bin101001111111010110001
32120220102001
411033322301
5323012141
645254001
714460301
oct5177261
92526361
101375921
1185a828
12564301
13392371
1427b601
151c2a31
hex14feb1

1375921 has 2 divisors, whose sum is σ = 1375922. Its totient is φ = 1375920.

The previous prime is 1375901. The next prime is 1375937. The reversal of 1375921 is 1295731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1354896 + 21025 = 1164^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375921 - 211 = 1373873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1375921.

It is not a weakly prime, because it can be changed into another prime (1375901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687960 + 687961.

It is an arithmetic number, because the mean of its divisors is an integer number (687961).

21375921 is an apocalyptic number.

It is an amenable number.

1375921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375921 is an equidigital number, since it uses as much as digits as its factorization.

1375921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 28.

The square root of 1375921 is about 1172.9965899354. The cubic root of 1375921 is about 111.2238266922.

The spelling of 1375921 in words is "one million, three hundred seventy-five thousand, nine hundred twenty-one".