1561606235 has 12 divisors (see below), whose sum is σ = 2179875168. Its totient is φ = 1070815536.

The previous prime is 1561606231. The next prime is 1561606253. The reversal of 1561606235 is 5326061651.

It is not a de Polignac number, because 1561606235 - 2² = 1561606231 is a prime.

It is a super-2 number, since 2×1561606235² = 4877228066381750450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561606195 and 1561606204.

It is not an unprimeable number, because it can be changed into a prime (1561606231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3186707 + ... + 3187196.

It is an arithmetic number, because the mean of its divisors is an integer number (181656264).

Almost surely, 2^1561606235 is an apocalyptic number.

1561606235 is a deficient number, since it is larger than the sum of its proper divisors (618268933).

1561606235 is an equidigital number, since it uses as much as digits as its factorization.

1561606235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373922 (or 6373915 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1561606235 is about 39517.1638025808. The cubic root of 1561606235 is about 1160.1759134225.

Adding to 1561606235 its reverse (5326061651), we get a palindrome (6887667886).

The spelling of 1561606235 in words is "one billion, five hundred sixty-one million, six hundred six thousand, two hundred thirty-five".