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BaseRepresentation
bin101010010101001110001
32121110202212
411102221301
5323341441
645421505
714535041
oct5225161
92543685
101387121
1186818a
1256a895
133974a8
14281721
151c5eeb
hex152a71

1387121 has 2 divisors, whose sum is σ = 1387122. Its totient is φ = 1387120.

The previous prime is 1387117. The next prime is 1387123. The reversal of 1387121 is 1217831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1132096 + 255025 = 1064^2 + 505^2 .

It is an emirp because it is prime and its reverse (1217831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1387121 - 22 = 1387117 is a prime.

Together with 1387123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1387123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693560 + 693561.

It is an arithmetic number, because the mean of its divisors is an integer number (693561).

21387121 is an apocalyptic number.

It is an amenable number.

1387121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387121 is an equidigital number, since it uses as much as digits as its factorization.

1387121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 1387121 is about 1177.7610114111. The cubic root of 1387121 is about 111.5247989241.

The spelling of 1387121 in words is "one million, three hundred eighty-seven thousand, one hundred twenty-one".