61121961 has 12 divisors (see below), whose sum is σ = 88365940. Its totient is φ = 40711680.

The previous prime is 61121941. The next prime is 61121999. The reversal of 61121961 is 16912116.

61121961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 44475561 = 4080^2 + 6669^2 .

It is not a de Polignac number, because 61121961 - 2⁶ = 61121897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61121941) 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, 11121 + ... + 15681.

Almost surely, 2^61121961 is an apocalyptic number.

It is an amenable number.

61121961 is a deficient number, since it is larger than the sum of its proper divisors (27243979).

61121961 is a wasteful number, since it uses less digits than its factorization.

61121961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6056 (or 6053 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 61121961 is about 7818.0535301314. The cubic root of 61121961 is about 393.9118929136.

The spelling of 61121961 in words is "sixty-one million, one hundred twenty-one thousand, nine hundred sixty-one".