61641697 has 8 divisors (see below), whose sum is σ = 66563840. Its totient is φ = 56745360.

The previous prime is 61641653. The next prime is 61641721. The reversal of 61641697 is 79614616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61641697 - 2¹⁵ = 61608929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61641637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329 + ... + 11182.

It is an arithmetic number, because the mean of its divisors is an integer number (8320480).

Almost surely, 2^61641697 is an apocalyptic number.

It is an amenable number.

61641697 is a deficient number, since it is larger than the sum of its proper divisors (4922143).

61641697 is a wasteful number, since it uses less digits than its factorization.

61641697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12903.

The product of its digits is 54432, while the sum is 40.

The square root of 61641697 is about 7851.2226436397. Note that the first 3 decimals coincide. The cubic root of 61641697 is about 395.0252550215.

The spelling of 61641697 in words is "sixty-one million, six hundred forty-one thousand, six hundred ninety-seven".