61697689 has 4 divisors (see below), whose sum is σ = 61715124. Its totient is φ = 61680256.

The previous prime is 61697663. The next prime is 61697717. The reversal of 61697689 is 98679616.

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 29888089 + 31809600 = 5467^2 + 5640^2 .

It is a cyclic number.

It is not a de Polignac number, because 61697689 - 2⁹ = 61697177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61697609) 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, 1312 + ... + 11185.

It is an arithmetic number, because the mean of its divisors is an integer number (15428781).

Almost surely, 2^61697689 is an apocalyptic number.

It is an amenable number.

61697689 is a deficient number, since it is larger than the sum of its proper divisors (17435).

61697689 is a wasteful number, since it uses less digits than its factorization.

61697689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17434.

The product of its digits is 979776, while the sum is 52.

The square root of 61697689 is about 7854.7876483072. The cubic root of 61697689 is about 395.1448253855.

The spelling of 61697689 in words is "sixty-one million, six hundred ninety-seven thousand, six hundred eighty-nine".