5551531 has 2 divisors, whose sum is σ = 5551532. Its totient is φ = 5551530.

The previous prime is 5551529. The next prime is 5551583. The reversal of 5551531 is 1351555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5551531 - 2¹ = 5551529 is a prime.

It is a super-2 number, since 2×5551531² = 61638992887922, which contains 22 as substring.

Together with 5551529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 5551496 and 5551505.

It is not a weakly prime, because it can be changed into another prime (5551501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775765 + 2775766.

It is an arithmetic number, because the mean of its divisors is an integer number (2775766).

Almost surely, 2^5551531 is an apocalyptic number.

5551531 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551531 is an equidigital number, since it uses as much as digits as its factorization.

5551531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1875, while the sum is 25.

The square root of 5551531 is about 2356.1687121257. The cubic root of 5551531 is about 177.0669839146.

The spelling of 5551531 in words is "five million, five hundred fifty-one thousand, five hundred thirty-one".