55172149 has 2 divisors, whose sum is σ = 55172150. Its totient is φ = 55172148.

The previous prime is 55172129. The next prime is 55172179. The reversal of 55172149 is 94127155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51581124 + 3591025 = 7182^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 55172149 - 2⁹ = 55171637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55172119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27586074 + 27586075.

It is an arithmetic number, because the mean of its divisors is an integer number (27586075).

Almost surely, 2^55172149 is an apocalyptic number.

It is an amenable number.

55172149 is a deficient number, since it is larger than the sum of its proper divisors (1).

55172149 is an equidigital number, since it uses as much as digits as its factorization.

55172149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 55172149 is about 7427.7957026294. The cubic root of 55172149 is about 380.6916052329.

The spelling of 55172149 in words is "fifty-five million, one hundred seventy-two thousand, one hundred forty-nine".