61965905 has 4 divisors (see below), whose sum is σ = 74359092. Its totient is φ = 49572720.

The previous prime is 61965899. The next prime is 61965919. The reversal of 61965905 is 50956916.

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 28430224 + 33535681 = 5332^2 + 5791^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61965905 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6196586 + ... + 6196595.

It is an arithmetic number, because the mean of its divisors is an integer number (18589773).

Almost surely, 2^61965905 is an apocalyptic number.

It is an amenable number.

61965905 is a deficient number, since it is larger than the sum of its proper divisors (12393187).

61965905 is a wasteful number, since it uses less digits than its factorization.

61965905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12393186.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 61965905 is about 7871.8425416163. The cubic root of 61965905 is about 395.7165969583.

The spelling of 61965905 in words is "sixty-one million, nine hundred sixty-five thousand, nine hundred five".