1217381 has 6 divisors (see below), whose sum is σ = 1338246. Its totient is φ = 1106600.

The previous prime is 1217351. The next prime is 1217393. The reversal of 1217381 is 1837121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 148225 = 1034^2 + 385^2 .

It is not a de Polignac number, because 1217381 - 2⁶ = 1217317 is a prime.

It is a super-2 number, since 2×1217381² = 2964032998322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4910 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (223041).

2^1217381 is an apocalyptic number.

1217381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1217381 is a deficient number, since it is larger than the sum of its proper divisors (120865).

1217381 is a wasteful number, since it uses less digits than its factorization.

1217381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10083 (or 10072 counting only the distinct ones).

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

The square root of 1217381 is about 1103.3498991707. The cubic root of 1217381 is about 106.7764570511.

The spelling of 1217381 in words is "one million, two hundred seventeen thousand, three hundred eighty-one".