61965121 has 4 divisors (see below), whose sum is σ = 63639892. Its totient is φ = 60290352.

The previous prime is 61965097. The next prime is 61965139. The reversal of 61965121 is 12156916.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23040000 + 38925121 = 4800^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 61965121 - 2⁵ = 61965089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61965181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837330 + ... + 837403.

It is an arithmetic number, because the mean of its divisors is an integer number (15909973).

Almost surely, 2^61965121 is an apocalyptic number.

It is an amenable number.

61965121 is a deficient number, since it is larger than the sum of its proper divisors (1674771).

61965121 is a wasteful number, since it uses less digits than its factorization.

61965121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674770.

The product of its digits is 3240, while the sum is 31.

The square root of 61965121 is about 7871.7927437147. The cubic root of 61965121 is about 395.7149280668.

The spelling of 61965121 in words is "sixty-one million, nine hundred sixty-five thousand, one hundred twenty-one".