1561093 has 8 divisors (see below), whose sum is σ = 1664280. Its totient is φ = 1459200.

The previous prime is 1561069. The next prime is 1561111. The reversal of 1561093 is 3901651.

It can be written as a sum of positive squares in 4 ways, for example, as 1292769 + 268324 = 1137^2 + 518^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561093 is a prime.

It is a super-2 number, since 2×1561093² = 4874022709298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561003) 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, 3693 + ... + 4093.

It is an arithmetic number, because the mean of its divisors is an integer number (208035).

2^1561093 is an apocalyptic number.

It is an amenable number.

1561093 is a deficient number, since it is larger than the sum of its proper divisors (103187).

1561093 is a wasteful number, since it uses less digits than its factorization.

1561093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1561093 is about 1249.4370732454. The cubic root of 1561093 is about 116.0048798978.

The spelling of 1561093 in words is "one million, five hundred sixty-one thousand, ninety-three".