55252381 has 2 divisors, whose sum is σ = 55252382. Its totient is φ = 55252380.

The previous prime is 55252349. The next prime is 55252391. The reversal of 55252381 is 18325255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 1229881 = 7350^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 55252381 - 2⁵ = 55252349 is a prime.

It is a super-2 number, since 2×55252381² = 6105651212338322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55252391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27626190 + 27626191.

It is an arithmetic number, because the mean of its divisors is an integer number (27626191).

Almost surely, 2^55252381 is an apocalyptic number.

It is an amenable number.

55252381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55252381 is an equidigital number, since it uses as much as digits as its factorization.

55252381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 31.

The square root of 55252381 is about 7433.1945353260. The cubic root of 55252381 is about 380.8760512848.

The spelling of 55252381 in words is "fifty-five million, two hundred fifty-two thousand, three hundred eighty-one".