61308971 has 4 divisors (see below), whose sum is σ = 61699632. Its totient is φ = 60918312.

The previous prime is 61308913. The next prime is 61308983. The reversal of 61308971 is 17980316.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61308971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61308911) 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, 195095 + ... + 195408.

It is an arithmetic number, because the mean of its divisors is an integer number (15424908).

Almost surely, 2^61308971 is an apocalyptic number.

61308971 is a deficient number, since it is larger than the sum of its proper divisors (390661).

61308971 is a wasteful number, since it uses less digits than its factorization.

61308971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390660.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 61308971 is about 7830.0045338429. The cubic root of 61308971 is about 394.3132241748.

The spelling of 61308971 in words is "sixty-one million, three hundred eight thousand, nine hundred seventy-one".