61125561 has 12 divisors (see below), whose sum is σ = 100905792. Its totient is φ = 34928856.

The previous prime is 61125511. The next prime is 61125563. The reversal of 61125561 is 16552116.

It is a happy number.

It is not a de Polignac number, because 61125561 - 2⁹ = 61125049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61125563) 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, 485061 + ... + 485186.

It is an arithmetic number, because the mean of its divisors is an integer number (8408816).

Almost surely, 2^61125561 is an apocalyptic number.

It is an amenable number.

61125561 is a deficient number, since it is larger than the sum of its proper divisors (39780231).

61125561 is a wasteful number, since it uses less digits than its factorization.

61125561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970260 (or 970257 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 61125561 is about 7818.2837630774. The cubic root of 61125561 is about 393.9196263858.

Adding to 61125561 its reverse (16552116), we get a palindrome (77677677).

The spelling of 61125561 in words is "sixty-one million, one hundred twenty-five thousand, five hundred sixty-one".