71961655 has 4 divisors (see below), whose sum is σ = 86353992. Its totient is φ = 57569320.

The previous prime is 71961649. The next prime is 71961719. The reversal of 71961655 is 55616917.

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

It is not a de Polignac number, because 71961655 - 2⁵ = 71961623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7196161 + ... + 7196170.

It is an arithmetic number, because the mean of its divisors is an integer number (21588498).

Almost surely, 2^71961655 is an apocalyptic number.

71961655 is a deficient number, since it is larger than the sum of its proper divisors (14392337).

71961655 is a wasteful number, since it uses less digits than its factorization.

71961655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14392336.

The product of its digits is 56700, while the sum is 40.

The square root of 71961655 is about 8483.0215725294. The cubic root of 71961655 is about 415.9428988902.

The spelling of 71961655 in words is "seventy-one million, nine hundred sixty-one thousand, six hundred fifty-five".