5427121561 has 9 divisors (see below), whose sum is σ = 5675114389. Its totient is φ = 5189539036.

The previous prime is 5427121543. The next prime is 5427121571. The reversal of 5427121561 is 1651217245.

The square root of 5427121561 is 73669.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 5427121561 - 2¹³ = 5427113369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5427121571) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1692786 + ... + 1695988.

Almost surely, 2^5427121561 is an apocalyptic number.

5427121561 is the 73669-th square number.

5427121561 is the 36835-th centered octagonal number.

It is an amenable number.

5427121561 is a deficient number, since it is larger than the sum of its proper divisors (247992828).

5427121561 is an frugal number, since it uses more digits than its factorization.

5427121561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452 (or 3226 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The cubic root of 5427121561 is about 1757.3429216829.

The spelling of 5427121561 in words is "five billion, four hundred twenty-seven million, one hundred twenty-one thousand, five hundred sixty-one".