71131420 has 12 divisors (see below), whose sum is σ = 149376024. Its totient is φ = 28452560.

The previous prime is 71131409. The next prime is 71131447. The reversal of 71131420 is 2413117.

It is a super-2 number, since 2×71131420² = 10119357822432800, 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 in 3 ways as a sum of consecutive naturals, for example, 1778266 + ... + 1778305.

It is an arithmetic number, because the mean of its divisors is an integer number (12448002).

Almost surely, 2^71131420 is an apocalyptic number.

It is an amenable number.

71131420 is an abundant number, since it is smaller than the sum of its proper divisors (78244604).

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

71131420 is a wasteful number, since it uses less digits than its factorization.

71131420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556580 (or 3556578 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 71131420 is about 8433.9445101328. The cubic root of 71131420 is about 414.3371039813.

Adding to 71131420 its reverse (2413117), we get a palindrome (73544537).

It can be divided in two parts, 711 and 31420, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 71131420 in words is "seventy-one million, one hundred thirty-one thousand, four hundred twenty".