61708961 has 4 divisors (see below), whose sum is σ = 62255172. Its totient is φ = 61162752.

The previous prime is 61708957. The next prime is 61708973. The reversal of 61708961 is 16980716.

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 384400 + 61324561 = 620^2 + 7831^2 .

It is a cyclic number.

It is not a de Polignac number, because 61708961 - 2² = 61708957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61708901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272936 + ... + 273161.

It is an arithmetic number, because the mean of its divisors is an integer number (15563793).

Almost surely, 2^61708961 is an apocalyptic number.

It is an amenable number.

61708961 is a deficient number, since it is larger than the sum of its proper divisors (546211).

61708961 is a wasteful number, since it uses less digits than its factorization.

61708961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546210.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61708961 is about 7855.5051397093. The cubic root of 61708961 is about 395.1688878818.

The spelling of 61708961 in words is "sixty-one million, seven hundred eight thousand, nine hundred sixty-one".