61711381 has 4 divisors (see below), whose sum is σ = 62004064. Its totient is φ = 61418700.

The previous prime is 61711361. The next prime is 61711409. The reversal of 61711381 is 18311716.

61711381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61711381 - 2¹⁵ = 61678613 is a prime.

It is a super-2 number, since 2×61711381² = 7616589089854322, 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 (61711361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146025 + ... + 146446.

It is an arithmetic number, because the mean of its divisors is an integer number (15501016).

Almost surely, 2^61711381 is an apocalyptic number.

It is an amenable number.

61711381 is a deficient number, since it is larger than the sum of its proper divisors (292683).

61711381 is a wasteful number, since it uses less digits than its factorization.

61711381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292682.

The product of its digits is 1008, while the sum is 28.

The square root of 61711381 is about 7855.6591703052. The cubic root of 61711381 is about 395.1740535077.

The spelling of 61711381 in words is "sixty-one million, seven hundred eleven thousand, three hundred eighty-one".