1101561025 has 12 divisors (see below), whose sum is σ = 1367645104. Its totient is φ = 880146000.

The previous prime is 1101561017. The next prime is 1101561029. The reversal of 1101561025 is 5201651011.

It is a happy number.

It is not a de Polignac number, because 1101561025 - 2³ = 1101561017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101560987 and 1101561005.

It is not an unprimeable number, because it can be changed into a prime (1101561029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6891 + ... + 47440.

Almost surely, 2^1101561025 is an apocalyptic number.

It is an amenable number.

1101561025 is a deficient number, since it is larger than the sum of its proper divisors (266084079).

1101561025 is an equidigital number, since it uses as much as digits as its factorization.

1101561025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55152 (or 55147 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1101561025 is about 33189.7728976864. The cubic root of 1101561025 is about 1032.7681922464.

The spelling of 1101561025 in words is "one billion, one hundred one million, five hundred sixty-one thousand, twenty-five".