71553641 has 4 divisors (see below), whose sum is σ = 72099984. Its totient is φ = 71007300.

The previous prime is 71553583. The next prime is 71553653. The reversal of 71553641 is 14635517.

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.

It is a cyclic number.

It is not a de Polignac number, because 71553641 - 2²² = 67359337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71553598 and 71553607.

It is not an unprimeable number, because it can be changed into a prime (71553541) 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, 272975 + ... + 273236.

It is an arithmetic number, because the mean of its divisors is an integer number (18024996).

Almost surely, 2^71553641 is an apocalyptic number.

It is an amenable number.

71553641 is a deficient number, since it is larger than the sum of its proper divisors (546343).

71553641 is a wasteful number, since it uses less digits than its factorization.

71553641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546342.

The product of its digits is 12600, while the sum is 32.

The square root of 71553641 is about 8458.9385267893. The cubic root of 71553641 is about 415.1552929249.

The spelling of 71553641 in words is "seventy-one million, five hundred fifty-three thousand, six hundred forty-one".