55211999 has 2 divisors, whose sum is σ = 55212000. Its totient is φ = 55211998.

The previous prime is 55211987. The next prime is 55212007. The reversal of 55211999 is 99911255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55211999 - 2¹² = 55207903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55211909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27605999 + 27606000.

It is an arithmetic number, because the mean of its divisors is an integer number (27606000).

Almost surely, 2^55211999 is an apocalyptic number.

55211999 is a deficient number, since it is larger than the sum of its proper divisors (1).

55211999 is an equidigital number, since it uses as much as digits as its factorization.

55211999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 41.

The square root of 55211999 is about 7430.4777100803. The cubic root of 55211999 is about 380.7832390839.

The spelling of 55211999 in words is "fifty-five million, two hundred eleven thousand, nine hundred ninety-nine".