61891927 has 4 divisors (see below), whose sum is σ = 61915840. Its totient is φ = 61868016.

The previous prime is 61891913. The next prime is 61891931. The reversal of 61891927 is 72919816.

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-61891927 is a prime.

It is a super-2 number, since 2×61891927² = 7661221255546658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891937) 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, 7527 + ... + 13432.

It is an arithmetic number, because the mean of its divisors is an integer number (15478960).

Almost surely, 2^61891927 is an apocalyptic number.

61891927 is a deficient number, since it is larger than the sum of its proper divisors (23913).

61891927 is a wasteful number, since it uses less digits than its factorization.

61891927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23912.

The product of its digits is 54432, while the sum is 43.

The square root of 61891927 is about 7867.1422384497. The cubic root of 61891927 is about 395.5590588204.

The spelling of 61891927 in words is "sixty-one million, eight hundred ninety-one thousand, nine hundred twenty-seven".