5581072921 has 4 divisors (see below), whose sum is σ = 5583066832. Its totient is φ = 5579079012.

The previous prime is 5581072897. The next prime is 5581072943. The reversal of 5581072921 is 1292701855.

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: 1292701855 = 5 ⋅258540371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5581072921 is a prime.

It is a super-2 number, since 2×5581072921² = 62296749899038944482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5581072961) 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, 992751 + ... + 998356.

It is an arithmetic number, because the mean of its divisors is an integer number (1395766708).

Almost surely, 2^5581072921 is an apocalyptic number.

It is an amenable number.

5581072921 is a deficient number, since it is larger than the sum of its proper divisors (1993911).

5581072921 is a wasteful number, since it uses less digits than its factorization.

5581072921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993910.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 5581072921 is about 74706.5788334602. The cubic root of 5581072921 is about 1773.8050989600.

The spelling of 5581072921 in words is "five billion, five hundred eighty-one million, seventy-two thousand, nine hundred twenty-one".