5487757721 has 4 divisors (see below), whose sum is σ = 5488219344. Its totient is φ = 5487296100.

The previous prime is 5487757687. The next prime is 5487757727. The reversal of 5487757721 is 1277577845.

It is a happy number.

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: 1277577845 = 5 ⋅255515569.

It is a cyclic number.

It is not a de Polignac number, because 5487757721 - 2³⁰ = 4414015897 is a prime.

It is a super-2 number, since 2×5487757721² = 60230969608790227682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5487757727) 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, 212495 + ... + 236916.

It is an arithmetic number, because the mean of its divisors is an integer number (1372054836).

Almost surely, 2^5487757721 is an apocalyptic number.

It is an amenable number.

5487757721 is a deficient number, since it is larger than the sum of its proper divisors (461623).

5487757721 is a wasteful number, since it uses less digits than its factorization.

5487757721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461622.

The product of its digits is 3841600, while the sum is 53.

The square root of 5487757721 is about 74079.4014622149. The cubic root of 5487757721 is about 1763.8635126331.

The spelling of 5487757721 in words is "five billion, four hundred eighty-seven million, seven hundred fifty-seven thousand, seven hundred twenty-one".