71512155 has 48 divisors (see below), whose sum is σ = 145637856. Its totient is φ = 32002560.

The previous prime is 71512153. The next prime is 71512169. The reversal of 71512155 is 55121517.

It is not a de Polignac number, because 71512155 - 2¹ = 71512153 is a prime.

It is a super-2 number, since 2×71512155² = 10227976625488050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71512153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 879 + ... + 11991.

It is an arithmetic number, because the mean of its divisors is an integer number (3034122).

Almost surely, 2^71512155 is an apocalyptic number.

71512155 is an abundant number, since it is smaller than the sum of its proper divisors (74125701).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71512155 is a wasteful number, since it uses less digits than its factorization.

71512155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11148 (or 11145 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 71512155 is about 8456.4859723173. The cubic root of 71512155 is about 415.0750432832.

The spelling of 71512155 in words is "seventy-one million, five hundred twelve thousand, one hundred fifty-five".