55212157 has 32 divisors (see below), whose sum is σ = 78059520. Its totient is φ = 37609920.

The previous prime is 55212127. The next prime is 55212173. The reversal of 55212157 is 75121255.

It is a cyclic number.

It is not a de Polignac number, because 55212157 - 2¹⁹ = 54687869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17568 + ... + 20470.

It is an arithmetic number, because the mean of its divisors is an integer number (2439360).

Almost surely, 2^55212157 is an apocalyptic number.

It is an amenable number.

55212157 is a deficient number, since it is larger than the sum of its proper divisors (22847363).

55212157 is a wasteful number, since it uses less digits than its factorization.

55212157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953.

The product of its digits is 3500, while the sum is 28.

The square root of 55212157 is about 7430.4883419598. The cubic root of 55212157 is about 380.7836023123.

It can be divided in two parts, 55 and 212157, that added together give a palindrome (212212).

The spelling of 55212157 in words is "fifty-five million, two hundred twelve thousand, one hundred fifty-seven".