61381187 has 8 divisors (see below), whose sum is σ = 72046176. Its totient is φ = 51190272.

The previous prime is 61381171. The next prime is 61381193. The reversal of 61381187 is 78118316.

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

It is not a de Polignac number, because 61381187 - 2⁴ = 61381171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61381157) 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, 118238 + ... + 118755.

It is an arithmetic number, because the mean of its divisors is an integer number (9005772).

Almost surely, 2^61381187 is an apocalyptic number.

61381187 is a deficient number, since it is larger than the sum of its proper divisors (10664989).

61381187 is a wasteful number, since it uses less digits than its factorization.

61381187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237037.

The product of its digits is 8064, while the sum is 35.

The square root of 61381187 is about 7834.6146682527. The cubic root of 61381187 is about 394.4679842917.

The spelling of 61381187 in words is "sixty-one million, three hundred eighty-one thousand, one hundred eighty-seven".