71501812 has 6 divisors (see below), whose sum is σ = 125128178. Its totient is φ = 35750904.

The previous prime is 71501809. The next prime is 71501831. The reversal of 71501812 is 21810517.

It can be written as a sum of positive squares in only one way, i.e., 65221776 + 6280036 = 8076^2 + 2506^2 .

It is a super-2 number, since 2×71501812² = 10225018238566688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8937723 + ... + 8937730.

Almost surely, 2^71501812 is an apocalyptic number.

It is an amenable number.

71501812 is a deficient number, since it is larger than the sum of its proper divisors (53626366).

71501812 is a wasteful number, since it uses less digits than its factorization.

71501812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17875457 (or 17875455 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 71501812 is about 8455.8744077712. The cubic root of 71501812 is about 415.0550311694.

The spelling of 71501812 in words is "seventy-one million, five hundred one thousand, eight hundred twelve".