71231505 has 16 divisors (see below), whose sum is σ = 115038144. Its totient is φ = 37634240.

The previous prime is 71231497. The next prime is 71231507. The reversal of 71231505 is 50513217.

It is not a de Polignac number, because 71231505 - 2³ = 71231497 is a prime.

It is a super-3 number, since 3×71231505³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (71231507) 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, 20586 + ... + 23795.

It is an arithmetic number, because the mean of its divisors is an integer number (7189884).

Almost surely, 2^71231505 is an apocalyptic number.

It is an amenable number.

71231505 is a deficient number, since it is larger than the sum of its proper divisors (43806639).

71231505 is a wasteful number, since it uses less digits than its factorization.

71231505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44496.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 71231505 is about 8439.8758877130. The cubic root of 71231505 is about 414.5313430143.

The spelling of 71231505 in words is "seventy-one million, two hundred thirty-one thousand, five hundred five".