55110781 has 6 divisors (see below), whose sum is σ = 60576446. Its totient is φ = 50100600.

The previous prime is 55110763. The next prime is 55110793. The reversal of 55110781 is 18701155.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 793881 = 7370^2 + 891^2 .

It is not a de Polignac number, because 55110781 - 2⁵ = 55110749 is a prime.

It is a super-2 number, since 2×55110781² = 6074396364859922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55110721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227610 + ... + 227851.

Almost surely, 2^55110781 is an apocalyptic number.

It is an amenable number.

55110781 is a deficient number, since it is larger than the sum of its proper divisors (5465665).

55110781 is a wasteful number, since it uses less digits than its factorization.

55110781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455483 (or 455472 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 55110781 is about 7423.6635834337. The cubic root of 55110781 is about 380.5504050672.

The spelling of 55110781 in words is "fifty-five million, one hundred ten thousand, seven hundred eighty-one".