71161540 has 24 divisors (see below), whose sum is σ = 155937600. Its totient is φ = 27226848.

The previous prime is 71161487. The next prime is 71161543. The reversal of 71161540 is 4516117.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (71161543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76890 + ... + 77809.

It is an arithmetic number, because the mean of its divisors is an integer number (6497400).

Almost surely, 2^71161540 is an apocalyptic number.

It is an amenable number.

71161540 is an abundant number, since it is smaller than the sum of its proper divisors (84776060).

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

71161540 is a wasteful number, since it uses less digits than its factorization.

71161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154731 (or 154729 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 71161540 is about 8435.7299624869. The cubic root of 71161540 is about 414.3955782462.

Adding to 71161540 its reverse (4516117), we get a palindrome (75677657).

The spelling of 71161540 in words is "seventy-one million, one hundred sixty-one thousand, five hundred forty".