Search a number
-
+
13891961 is a prime number
BaseRepresentation
bin110100111111…
…100101111001
3222010210012002
4310333211321
512024020321
61213430345
7226036226
oct64774571
928123162
1013891961
117929266
12479b3b5
132b551c5
141bb894d
15134620b
hexd3f979

13891961 has 2 divisors, whose sum is σ = 13891962. Its totient is φ = 13891960.

The previous prime is 13891949. The next prime is 13891979. The reversal of 13891961 is 16919831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13366336 + 525625 = 3656^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891961 - 26 = 13891897 is a prime.

It is not a weakly prime, because it can be changed into another prime (13891901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945980 + 6945981.

It is an arithmetic number, because the mean of its divisors is an integer number (6945981).

Almost surely, 213891961 is an apocalyptic number.

It is an amenable number.

13891961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891961 is an equidigital number, since it uses as much as digits as its factorization.

13891961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 13891961 is about 3727.1921066669. The cubic root of 13891961 is about 240.3926500817.

The spelling of 13891961 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred sixty-one".