1375000561 has 9 divisors (see below), whose sum is σ = 1511812729. Its totient is φ = 1249629700.

The previous prime is 1375000553. The next prime is 1375000589. The reversal of 1375000561 is 1650005731.

The square root of 1375000561 is 37081.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1375000561 - 2³ = 1375000553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375000261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 406206 + ... + 409576.

Almost surely, 2^1375000561 is an apocalyptic number.

1375000561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1375000561 is the 37081-st square number.

1375000561 is the 18541-st centered octagonal number.

It is an amenable number.

1375000561 is a deficient number, since it is larger than the sum of its proper divisors (136812168).

1375000561 is an frugal number, since it uses more digits than its factorization.

1375000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6764 (or 3382 counting only the distinct ones).

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

The cubic root of 1375000561 is about 1111.9901965153.

The spelling of 1375000561 in words is "one billion, three hundred seventy-five million, five hundred sixty-one", and thus it is an aban number.