61911971 has 4 divisors (see below), whose sum is σ = 67540344. Its totient is φ = 56283600.

The previous prime is 61911947. The next prime is 61911973. The reversal of 61911971 is 17911916.

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

It is a cyclic number.

It is not a de Polignac number, because 61911971 - 2⁶ = 61911907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61911973) 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, 2814170 + ... + 2814191.

It is an arithmetic number, because the mean of its divisors is an integer number (16885086).

Almost surely, 2^61911971 is an apocalyptic number.

61911971 is a deficient number, since it is larger than the sum of its proper divisors (5628373).

61911971 is a wasteful number, since it uses less digits than its factorization.

61911971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628372.

The product of its digits is 3402, while the sum is 35.

The square root of 61911971 is about 7868.4160413644. The cubic root of 61911971 is about 395.6017554499.

The spelling of 61911971 in words is "sixty-one million, nine hundred eleven thousand, nine hundred seventy-one".