61981327 has 8 divisors (see below), whose sum is σ = 64859616. Its totient is φ = 59166432.

The previous prime is 61981321. The next prime is 61981333. The reversal of 61981327 is 72318916.

It is an interprime number because it is at equal distance from previous prime (61981321) and next prime (61981333).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61981327 - 2¹⁵ = 61948559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61981321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13843 + ... + 17764.

It is an arithmetic number, because the mean of its divisors is an integer number (8107452).

Almost surely, 2^61981327 is an apocalyptic number.

61981327 is a deficient number, since it is larger than the sum of its proper divisors (2878289).

61981327 is a wasteful number, since it uses less digits than its factorization.

61981327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31697.

The product of its digits is 18144, while the sum is 37.

The square root of 61981327 is about 7872.8220480333. The cubic root of 61981327 is about 395.7494227257.

The spelling of 61981327 in words is "sixty-one million, nine hundred eighty-one thousand, three hundred twenty-seven".