1375531 has 2 divisors, whose sum is σ = 1375532. Its totient is φ = 1375530.

The previous prime is 1375513. The next prime is 1375547. The reversal of 1375531 is 1355731.

Together with previous prime (1375513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1375531 - 2⁹ = 1375019 is a prime.

It is a super-2 number, since 2×1375531² = 3784171063922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1375496 and 1375505.

It is not a weakly prime, because it can be changed into another prime (1375571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687765 + 687766.

It is an arithmetic number, because the mean of its divisors is an integer number (687766).

2^1375531 is an apocalyptic number.

1375531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375531 is an equidigital number, since it uses as much as digits as its factorization.

1375531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1575, while the sum is 25.

The square root of 1375531 is about 1172.8303372611. The cubic root of 1375531 is about 111.2133170308.

The spelling of 1375531 in words is "one million, three hundred seventy-five thousand, five hundred thirty-one".