55123261 has 2 divisors, whose sum is σ = 55123262. Its totient is φ = 55123260.

The previous prime is 55123247. The next prime is 55123273. The reversal of 55123261 is 16232155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43692100 + 11431161 = 6610^2 + 3381^2 .

It is a cyclic number.

It is not a de Polignac number, because 55123261 - 2¹⁵ = 55090493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55123241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561630 + 27561631.

It is an arithmetic number, because the mean of its divisors is an integer number (27561631).

Almost surely, 2^55123261 is an apocalyptic number.

It is an amenable number.

55123261 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123261 is an equidigital number, since it uses as much as digits as its factorization.

55123261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 55123261 is about 7424.5040911835. The cubic root of 55123261 is about 380.5791284889.

The spelling of 55123261 in words is "fifty-five million, one hundred twenty-three thousand, two hundred sixty-one".