1561285 has 8 divisors (see below), whose sum is σ = 2043936. Its totient is φ = 1135440.

The previous prime is 1561279. The next prime is 1561303. The reversal of 1561285 is 5821651.

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

It is not a de Polignac number, because 1561285 - 2¹³ = 1553093 is a prime.

It is a super-2 number, since 2×1561285² = 4875221702450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14139 + ... + 14248.

It is an arithmetic number, because the mean of its divisors is an integer number (255492).

2^1561285 is an apocalyptic number.

It is an amenable number.

1561285 is a deficient number, since it is larger than the sum of its proper divisors (482651).

1561285 is a wasteful number, since it uses less digits than its factorization.

1561285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28403.

The product of its digits is 2400, while the sum is 28.

The square root of 1561285 is about 1249.5139054848. The cubic root of 1561285 is about 116.0096355452.

It can be divided in two parts, 156 and 1285, that added together give a palindrome (1441).

The spelling of 1561285 in words is "one million, five hundred sixty-one thousand, two hundred eighty-five".