61109961 has 12 divisors (see below), whose sum is σ = 89561136. Its totient is φ = 37036120.

The previous prime is 61109957. The next prime is 61109969. The reversal of 61109961 is 16990116.

It is not a de Polignac number, because 61109961 - 2² = 61109957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61109969) 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, 83811 + ... + 84536.

It is an arithmetic number, because the mean of its divisors is an integer number (7463428).

Almost surely, 2^61109961 is an apocalyptic number.

It is an amenable number.

61109961 is a deficient number, since it is larger than the sum of its proper divisors (28451175).

61109961 is a wasteful number, since it uses less digits than its factorization.

61109961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168372 (or 168361 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 61109961 is about 7817.2860380058. The cubic root of 61109961 is about 393.8861124793.

The spelling of 61109961 in words is "sixty-one million, one hundred nine thousand, nine hundred sixty-one".