71321507 has 4 divisors (see below), whose sum is σ = 71338440. Its totient is φ = 71304576.

The previous prime is 71321491. The next prime is 71321519. The reversal of 71321507 is 70512317.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70512317 = 541 ⋅130337.

It is a cyclic number.

It is not a de Polignac number, because 71321507 - 2⁴ = 71321491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71341507) 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, 3344 + ... + 12402.

It is an arithmetic number, because the mean of its divisors is an integer number (17834610).

Almost surely, 2^71321507 is an apocalyptic number.

71321507 is a deficient number, since it is larger than the sum of its proper divisors (16933).

71321507 is an equidigital number, since it uses as much as digits as its factorization.

71321507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16932.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 71321507 is about 8445.2061549734. The cubic root of 71321507 is about 414.7058582452.

The spelling of 71321507 in words is "seventy-one million, three hundred twenty-one thousand, five hundred seven".