1561937 has 8 divisors (see below), whose sum is σ = 1696296. Its totient is φ = 1429632.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561937 is 7391651.

It can be written as a sum of positive squares in 4 ways, for example, as 271441 + 1290496 = 521^2 + 1136^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1561937 - 2¹⁰ = 1560913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561037) 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, 1343 + ... + 2219.

It is an arithmetic number, because the mean of its divisors is an integer number (212037).

2^1561937 is an apocalyptic number.

It is an amenable number.

1561937 is a deficient number, since it is larger than the sum of its proper divisors (134359).

1561937 is a wasteful number, since it uses less digits than its factorization.

1561937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027.

The product of its digits is 5670, while the sum is 32.

The square root of 1561937 is about 1249.7747797103. The cubic root of 1561937 is about 116.0257820220.

The spelling of 1561937 in words is "one million, five hundred sixty-one thousand, nine hundred thirty-seven".