1161256025 has 24 divisors (see below), whose sum is σ = 1484250240. Its totient is φ = 900797760.

The previous prime is 1161256021. The next prime is 1161256067. The reversal of 1161256025 is 5206521611.

It is a happy number.

It is not a de Polignac number, because 1161256025 - 2² = 1161256021 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1161256021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123542 + ... + 132608.

It is an arithmetic number, because the mean of its divisors is an integer number (61843760).

Almost surely, 2^1161256025 is an apocalyptic number.

It is an amenable number.

1161256025 is a deficient number, since it is larger than the sum of its proper divisors (322994215).

1161256025 is a wasteful number, since it uses less digits than its factorization.

1161256025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233 (or 9228 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1161256025 is about 34077.2068250906. The cubic root of 1161256025 is about 1051.0966697580.

Adding to 1161256025 its reverse (5206521611), we get a palindrome (6367777636).

The spelling of 1161256025 in words is "one billion, one hundred sixty-one million, two hundred fifty-six thousand, twenty-five".