1361781 has 12 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 896424.

The previous prime is 1361777. The next prime is 1361791. The reversal of 1361781 is 1871631.

It is not a de Polignac number, because 1361781 - 2² = 1361777 is a prime.

It is a super-2 number, since 2×1361781² = 3708894983922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (165984).

2^1361781 is an apocalyptic number.

It is an amenable number.

1361781 is a deficient number, since it is larger than the sum of its proper divisors (630027).

1361781 is a wasteful number, since it uses less digits than its factorization.

1361781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1909 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 1361781 is about 1166.9537265890. The cubic root of 1361781 is about 110.8415074279.

The spelling of 1361781 in words is "one million, three hundred sixty-one thousand, seven hundred eighty-one".