71533381 has 16 divisors (see below), whose sum is σ = 77045760. Its totient is φ = 66250800.

The previous prime is 71533369. The next prime is 71533387. The reversal of 71533381 is 18333517.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 71533381 - 2⁵ = 71533349 is a prime.

It is a super-2 number, since 2×71533381² = 10234049194582322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71533387) 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, 149100 + ... + 149578.

It is an arithmetic number, because the mean of its divisors is an integer number (4815360).

Almost surely, 2^71533381 is an apocalyptic number.

It is an amenable number.

71533381 is a deficient number, since it is larger than the sum of its proper divisors (5512379).

71533381 is a wasteful number, since it uses less digits than its factorization.

71533381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696.

The product of its digits is 7560, while the sum is 31.

The square root of 71533381 is about 8457.7408922241. The cubic root of 71533381 is about 415.1161062854.

Adding to 71533381 its reverse (18333517), we get a palindrome (89866898).

The spelling of 71533381 in words is "seventy-one million, five hundred thirty-three thousand, three hundred eighty-one".