61591887 has 16 divisors (see below), whose sum is σ = 104282880. Its totient is φ = 35195256.

The previous prime is 61591813. The next prime is 61591889. The reversal of 61591887 is 78819516.

It is not a de Polignac number, because 61591887 - 2⁷ = 61591759 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61591889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162753 + ... + 163130.

It is an arithmetic number, because the mean of its divisors is an integer number (6517680).

Almost surely, 2^61591887 is an apocalyptic number.

61591887 is a deficient number, since it is larger than the sum of its proper divisors (42690993).

61591887 is a wasteful number, since it uses less digits than its factorization.

61591887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325899 (or 325893 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 61591887 is about 7848.0498851626. The cubic root of 61591887 is about 394.9188253852.

The spelling of 61591887 in words is "sixty-one million, five hundred ninety-one thousand, eight hundred eighty-seven".