1381537 has 2 divisors, whose sum is σ = 1381538. Its totient is φ = 1381536.

The previous prime is 1381529. The next prime is 1381553. The reversal of 1381537 is 7351831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 349281 = 1016^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381537 - 2³ = 1381529 is a prime.

1381537 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1381507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690768 + 690769.

It is an arithmetic number, because the mean of its divisors is an integer number (690769).

2^1381537 is an apocalyptic number.

It is an amenable number.

1381537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381537 is an equidigital number, since it uses as much as digits as its factorization.

1381537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 1381537 is about 1175.3880210382. The cubic root of 1381537 is about 111.3749460981.

The spelling of 1381537 in words is "one million, three hundred eighty-one thousand, five hundred thirty-seven".