55016531 has 2 divisors, whose sum is σ = 55016532. Its totient is φ = 55016530.

The previous prime is 55016519. The next prime is 55016587. The reversal of 55016531 is 13561055.

55016531 is nontrivially palindromic in base 8.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55016531 is a prime.

It is a super-2 number, since 2×55016531² = 6053637366547922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55016531.

It is not a weakly prime, because it can be changed into another prime (55016501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27508265 + 27508266.

It is an arithmetic number, because the mean of its divisors is an integer number (27508266).

Almost surely, 2^55016531 is an apocalyptic number.

55016531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55016531 is an equidigital number, since it uses as much as digits as its factorization.

55016531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 55016531 is about 7417.3129231549. The cubic root of 55016531 is about 380.3333432335. Note that the first 4 decimals are identical.

Adding to 55016531 its reverse (13561055), we get a palindrome (68577586).

The spelling of 55016531 in words is "fifty-five million, sixteen thousand, five hundred thirty-one".