61385091 has 8 divisors (see below), whose sum is σ = 85405440. Its totient is φ = 39144072.

The previous prime is 61385089. The next prime is 61385099. The reversal of 61385091 is 19058316.

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

It is not a de Polignac number, because 61385091 - 2¹ = 61385089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61385099) 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, 444751 + ... + 444888.

It is an arithmetic number, because the mean of its divisors is an integer number (10675680).

Almost surely, 2^61385091 is an apocalyptic number.

61385091 is a deficient number, since it is larger than the sum of its proper divisors (24020349).

61385091 is a wasteful number, since it uses less digits than its factorization.

61385091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889665.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 61385091 is about 7834.8638150258. The cubic root of 61385091 is about 394.4763471709.

The spelling of 61385091 in words is "sixty-one million, three hundred eighty-five thousand, ninety-one".