5491721157 has 32 divisors (see below), whose sum is σ = 8527099392. Its totient is φ = 3113032704.

The previous prime is 5491721141. The next prime is 5491721171. The reversal of 5491721157 is 7511271945.

It is not a de Polignac number, because 5491721157 - 2⁴ = 5491721141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5491721657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56958 + ... + 119279.

It is an arithmetic number, because the mean of its divisors is an integer number (266471856).

Almost surely, 2^5491721157 is an apocalyptic number.

It is an amenable number.

5491721157 is a deficient number, since it is larger than the sum of its proper divisors (3035378235).

5491721157 is a wasteful number, since it uses less digits than its factorization.

5491721157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176317.

The product of its digits is 88200, while the sum is 42.

The square root of 5491721157 is about 74106.1479028562. The cubic root of 5491721157 is about 1764.2880501912.

The spelling of 5491721157 in words is "five billion, four hundred ninety-one million, seven hundred twenty-one thousand, one hundred fifty-seven".