55071631 has 2 divisors, whose sum is σ = 55071632. Its totient is φ = 55071630.

The previous prime is 55071613. The next prime is 55071641. The reversal of 55071631 is 13617055.

55071631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (55071613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55071631 - 2²¹ = 52974479 is a prime.

It is a super-2 number, since 2×55071631² = 6065769082000322, 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 55071631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55071641) 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, 27535815 + 27535816.

It is an arithmetic number, because the mean of its divisors is an integer number (27535816).

Almost surely, 2^55071631 is an apocalyptic number.

55071631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55071631 is an equidigital number, since it uses as much as digits as its factorization.

55071631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 55071631 is about 7421.0262767356. The cubic root of 55071631 is about 380.4602709931.

Adding to 55071631 its reverse (13617055), we get a palindrome (68688686).

The spelling of 55071631 in words is "fifty-five million, seventy-one thousand, six hundred thirty-one".