14961781 has 2 divisors, whose sum is σ = 14961782. Its totient is φ = 14961780.

The previous prime is 14961773. The next prime is 14961787. The reversal of 14961781 is 18716941.

14961781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13359025 + 1602756 = 3655^2 + 1266^2 .

It is an emirp because it is prime and its reverse (18716941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 14961781 - 2³ = 14961773 is a prime.

It is a super-2 number, since 2×14961781² = 447709781383922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 14961781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14961787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7480890 + 7480891.

It is an arithmetic number, because the mean of its divisors is an integer number (7480891).

Almost surely, 2^14961781 is an apocalyptic number.

It is an amenable number.

14961781 is a deficient number, since it is larger than the sum of its proper divisors (1).

14961781 is an equidigital number, since it uses as much as digits as its factorization.

14961781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 14961781 is about 3868.0461476048. The cubic root of 14961781 is about 246.4115711540.

The spelling of 14961781 in words is "fourteen million, nine hundred sixty-one thousand, seven hundred eighty-one".