1137561 has 4 divisors (see below), whose sum is σ = 1516752. Its totient is φ = 758372.

The previous prime is 1137553. The next prime is 1137569. The reversal of 1137561 is 1657311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1137553) and next prime (1137569).

It is a cyclic number.

It is not a de Polignac number, because 1137561 - 2³ = 1137553 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1137569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189591 + ... + 189596.

It is an arithmetic number, because the mean of its divisors is an integer number (379188).

2^1137561 is an apocalyptic number.

It is an amenable number.

1137561 is a deficient number, since it is larger than the sum of its proper divisors (379191).

1137561 is an equidigital number, since it uses as much as digits as its factorization.

1137561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379190.

The product of its digits is 630, while the sum is 24.

The square root of 1137561 is about 1066.5650472428. The cubic root of 1137561 is about 104.3898398826.

The spelling of 1137561 in words is "one million, one hundred thirty-seven thousand, five hundred sixty-one".