61941882391 has 4 divisors (see below), whose sum is σ = 64077809400. Its totient is φ = 59805955384.

The previous prime is 61941882389. The next prime is 61941882413. The reversal of 61941882391 is 19328814916.

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 61941882391 - 2¹ = 61941882389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61941882361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067963461 + ... + 1067963518.

It is an arithmetic number, because the mean of its divisors is an integer number (16019452350).

Almost surely, 2^61941882391 is an apocalyptic number.

61941882391 is a deficient number, since it is larger than the sum of its proper divisors (2135927009).

61941882391 is a wasteful number, since it uses less digits than its factorization.

61941882391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135927008.

The product of its digits is 746496, while the sum is 52.

The spelling of 61941882391 in words is "sixty-one billion, nine hundred forty-one million, eight hundred eighty-two thousand, three hundred ninety-one".