55121029 has 2 divisors, whose sum is σ = 55121030. Its totient is φ = 55121028.

The previous prime is 55121023. The next prime is 55121051. The reversal of 55121029 is 92012155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54730404 + 390625 = 7398^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 55121029 - 2²¹ = 53023877 is a prime.

It is equal to p_3289030 and since 55121029 and 3289030 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 55120994 and 55121012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27560514 + 27560515.

It is an arithmetic number, because the mean of its divisors is an integer number (27560515).

Almost surely, 2^55121029 is an apocalyptic number.

It is an amenable number.

55121029 is a deficient number, since it is larger than the sum of its proper divisors (1).

55121029 is an equidigital number, since it uses as much as digits as its factorization.

55121029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 55121029 is about 7424.3537765923. The cubic root of 55121029 is about 380.5739917338.

The spelling of 55121029 in words is "fifty-five million, one hundred twenty-one thousand, twenty-nine".