5551117921 has 8 divisors (see below), whose sum is σ = 5573592360. Its totient is φ = 5528675328.

The previous prime is 5551117841. The next prime is 5551117927. The reversal of 5551117921 is 1297111555.

It can be written as a sum of positive squares in 4 ways, for example, as 32262400 + 5518855521 = 5680^2 + 74289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5551117921 - 2⁹ = 5551117409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5551117927) 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, 378595 + ... + 392983.

It is an arithmetic number, because the mean of its divisors is an integer number (696699045).

Almost surely, 2^5551117921 is an apocalyptic number.

It is an amenable number.

5551117921 is a deficient number, since it is larger than the sum of its proper divisors (22474439).

5551117921 is a wasteful number, since it uses less digits than its factorization.

5551117921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15923.

The product of its digits is 15750, while the sum is 37.

The square root of 5551117921 is about 74505.8247454519. The cubic root of 5551117921 is about 1770.6259206508.

The spelling of 5551117921 in words is "five billion, five hundred fifty-one million, one hundred seventeen thousand, nine hundred twenty-one".