71154561 has 4 divisors (see below), whose sum is σ = 94872752. Its totient is φ = 47436372.

The previous prime is 71154547. The next prime is 71154583. The reversal of 71154561 is 16545117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16545117 = 3 ⋅5515039.

It is not a de Polignac number, because 71154561 - 2⁵ = 71154529 is a prime.

It is a super-2 number, since 2×71154561² = 10125943102205442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71153561) 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, 11859091 + ... + 11859096.

It is an arithmetic number, because the mean of its divisors is an integer number (23718188).

Almost surely, 2^71154561 is an apocalyptic number.

It is an amenable number.

71154561 is a deficient number, since it is larger than the sum of its proper divisors (23718191).

71154561 is a wasteful number, since it uses less digits than its factorization.

71154561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23718190.

The product of its digits is 4200, while the sum is 30.

The square root of 71154561 is about 8435.3162951960. The cubic root of 71154561 is about 414.3820308474.

Adding to 71154561 its reverse (16545117), we get a palindrome (87699678).

The spelling of 71154561 in words is "seventy-one million, one hundred fifty-four thousand, five hundred sixty-one".