61938381 has 8 divisors (see below), whose sum is σ = 83041504. Its totient is φ = 41063760.

The previous prime is 61938353. The next prime is 61938391. The reversal of 61938381 is 18383916.

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

It is a de Polignac number, because none of the positive numbers 2^k-61938381 is a prime.

It is a super-2 number, since 2×61938381² = 7672726081802322, 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 (61938311) 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, 56491 + ... + 57576.

It is an arithmetic number, because the mean of its divisors is an integer number (10380188).

Almost surely, 2^61938381 is an apocalyptic number.

It is an amenable number.

61938381 is a deficient number, since it is larger than the sum of its proper divisors (21103123).

61938381 is a wasteful number, since it uses less digits than its factorization.

61938381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114251.

The product of its digits is 31104, while the sum is 39.

The square root of 61938381 is about 7870.0940909242. The cubic root of 61938381 is about 395.6579985154.

The spelling of 61938381 in words is "sixty-one million, nine hundred thirty-eight thousand, three hundred eighty-one".