61512871 has 4 divisors (see below), whose sum is σ = 70300432. Its totient is φ = 52725312.

The previous prime is 61512859. The next prime is 61512911. The reversal of 61512871 is 17821516.

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

It is a cyclic number.

It is not a de Polignac number, because 61512871 - 2⁵ = 61512839 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 (61512071) 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, 4393770 + ... + 4393783.

It is an arithmetic number, because the mean of its divisors is an integer number (17575108).

Almost surely, 2^61512871 is an apocalyptic number.

61512871 is a deficient number, since it is larger than the sum of its proper divisors (8787561).

61512871 is an equidigital number, since it uses as much as digits as its factorization.

61512871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8787560.

The product of its digits is 3360, while the sum is 31.

The square root of 61512871 is about 7843.0141527349. The cubic root of 61512871 is about 394.7498731570.

The spelling of 61512871 in words is "sixty-one million, five hundred twelve thousand, eight hundred seventy-one".