1375981 has 2 divisors, whose sum is σ = 1375982. Its totient is φ = 1375980.

The previous prime is 1375951. The next prime is 1375987. The reversal of 1375981 is 1895731.

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., 837225 + 538756 = 915^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375981 - 2⁵ = 1375949 is a prime.

It is a super-2 number, since 2×1375981² = 3786647424722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687990 + 687991.

It is an arithmetic number, because the mean of its divisors is an integer number (687991).

2^1375981 is an apocalyptic number.

It is an amenable number.

1375981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375981 is an equidigital number, since it uses as much as digits as its factorization.

1375981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 34.

The square root of 1375981 is about 1173.0221651785. The cubic root of 1375981 is about 111.2254433869.

The spelling of 1375981 in words is "one million, three hundred seventy-five thousand, nine hundred eighty-one".