61747381 has 8 divisors (see below), whose sum is σ = 64306944. Its totient is φ = 59223360.

The previous prime is 61747379. The next prime is 61747391. The reversal of 61747381 is 18374716.

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 61747381 - 2¹ = 61747379 is a prime.

It is a super-3 number, since 3×61747381³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 61747381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61747391) 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, 5311 + ... + 12316.

It is an arithmetic number, because the mean of its divisors is an integer number (8038368).

Almost surely, 2^61747381 is an apocalyptic number.

It is an amenable number.

61747381 is a deficient number, since it is larger than the sum of its proper divisors (2559563).

61747381 is a wasteful number, since it uses less digits than its factorization.

61747381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17771.

The product of its digits is 28224, while the sum is 37.

The square root of 61747381 is about 7857.9501780044. The cubic root of 61747381 is about 395.2508815862.

It can be divided in two parts, 61747 and 381, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 61747381 in words is "sixty-one million, seven hundred forty-seven thousand, three hundred eighty-one".