61871959 has 4 divisors (see below), whose sum is σ = 65511504. Its totient is φ = 58232416.

The previous prime is 61871947. The next prime is 61871977. The reversal of 61871959 is 95917816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61871959 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 (61871989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819747 + ... + 1819780.

It is an arithmetic number, because the mean of its divisors is an integer number (16377876).

Almost surely, 2^61871959 is an apocalyptic number.

61871959 is a deficient number, since it is larger than the sum of its proper divisors (3639545).

61871959 is a wasteful number, since it uses less digits than its factorization.

61871959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639544.

The product of its digits is 136080, while the sum is 46.

The square root of 61871959 is about 7865.8730602521. The cubic root of 61871959 is about 395.5165149150.

The spelling of 61871959 in words is "sixty-one million, eight hundred seventy-one thousand, nine hundred fifty-nine".