1375561 has 8 divisors (see below), whose sum is σ = 1566144. Its totient is φ = 1195920.

The previous prime is 1375547. The next prime is 1375567. The reversal of 1375561 is 1655731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1375561 - 2⁷ = 1375433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2466 + ... + 2971.

It is an arithmetic number, because the mean of its divisors is an integer number (195768).

2^1375561 is an apocalyptic number.

1375561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1375561 is a deficient number, since it is larger than the sum of its proper divisors (190583).

1375561 is a wasteful number, since it uses less digits than its factorization.

1375561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471.

The product of its digits is 3150, while the sum is 28.

The square root of 1375561 is about 1172.8431267650. The cubic root of 1375561 is about 111.2141255368.

It can be divided in two parts, 1375 and 561, that added together give a square (1936 = 44²).

The spelling of 1375561 in words is "one million, three hundred seventy-five thousand, five hundred sixty-one".