61591071 has 8 divisors (see below), whose sum is σ = 82288000. Its totient is φ = 40977432.

The previous prime is 61591069. The next prime is 61591109. The reversal of 61591071 is 17019516.

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

It is not a de Polignac number, because 61591071 - 2¹ = 61591069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61591001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19075 + ... + 22068.

It is an arithmetic number, because the mean of its divisors is an integer number (10286000).

Almost surely, 2^61591071 is an apocalyptic number.

61591071 is a deficient number, since it is larger than the sum of its proper divisors (20696929).

61591071 is a wasteful number, since it uses less digits than its factorization.

61591071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41645.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 61591071 is about 7847.9978975532. The cubic root of 61591071 is about 394.9170813504.

The spelling of 61591071 in words is "sixty-one million, five hundred ninety-one thousand, seventy-one".