61773381 has 16 divisors (see below), whose sum is σ = 91984000. Its totient is φ = 40971744.

The previous prime is 61773379. The next prime is 61773401. The reversal of 61773381 is 18337716.

61773381 is a `hidden beast` number, since 617 + 7 + 3 + 38 + 1 = 666.

It is not a de Polignac number, because 61773381 - 2¹ = 61773379 is a prime.

It is a super-2 number, since 2×61773381² = 7631901200342322, 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 (61773301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376 + ... + 11121.

It is an arithmetic number, because the mean of its divisors is an integer number (5749000).

Almost surely, 2^61773381 is an apocalyptic number.

It is an amenable number.

61773381 is a deficient number, since it is larger than the sum of its proper divisors (30210619).

61773381 is a wasteful number, since it uses less digits than its factorization.

61773381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11705 (or 11699 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 61773381 is about 7859.6043793565. The cubic root of 61773381 is about 395.3063499624.

The spelling of 61773381 in words is "sixty-one million, seven hundred seventy-three thousand, three hundred eighty-one".