55211405 has 16 divisors (see below), whose sum is σ = 67827504. Its totient is φ = 43130880.

The previous prime is 55211383. The next prime is 55211407. The reversal of 55211405 is 50411255.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5621641 + 49589764 = 2371^2 + 7042^2 .

It is not a de Polignac number, because 55211405 - 2²² = 51017101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55211407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47309 + ... + 48461.

It is an arithmetic number, because the mean of its divisors is an integer number (4239219).

Almost surely, 2^55211405 is an apocalyptic number.

It is an amenable number.

55211405 is a deficient number, since it is larger than the sum of its proper divisors (12616099).

55211405 is a wasteful number, since it uses less digits than its factorization.

55211405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 55211405 is about 7430.4377394606. The cubic root of 55211405 is about 380.7818735230.

The spelling of 55211405 in words is "fifty-five million, two hundred eleven thousand, four hundred five".