71042131 has 4 divisors (see below), whose sum is σ = 71185000. Its totient is φ = 70899264.

The previous prime is 71042123. The next prime is 71042171. The reversal of 71042131 is 13124017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13124017 = 17 ⋅772001.

It is a cyclic number.

It is not a de Polignac number, because 71042131 - 2³ = 71042123 is a prime.

It is a super-2 number, since 2×71042131² = 10093968754042322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71042099 and 71042108.

It is not an unprimeable number, because it can be changed into a prime (71042171) 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, 70686 + ... + 71683.

It is an arithmetic number, because the mean of its divisors is an integer number (17796250).

Almost surely, 2^71042131 is an apocalyptic number.

71042131 is a deficient number, since it is larger than the sum of its proper divisors (142869).

71042131 is a wasteful number, since it uses less digits than its factorization.

71042131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142868.

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

The square root of 71042131 is about 8428.6494173147. The cubic root of 71042131 is about 414.1636633445.

Adding to 71042131 its reverse (13124017), we get a palindrome (84166148).

The spelling of 71042131 in words is "seventy-one million, forty-two thousand, one hundred thirty-one".