55412381 has 2 divisors, whose sum is σ = 55412382. Its totient is φ = 55412380.

The previous prime is 55412363. The next prime is 55412429. The reversal of 55412381 is 18321455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36844900 + 18567481 = 6070^2 + 4309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55412381 is a prime.

It is a super-2 number, since 2×55412381² = 6141063936178322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55412311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27706190 + 27706191.

It is an arithmetic number, because the mean of its divisors is an integer number (27706191).

Almost surely, 2^55412381 is an apocalyptic number.

It is an amenable number.

55412381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55412381 is an equidigital number, since it uses as much as digits as its factorization.

55412381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 55412381 is about 7443.9492878445. The cubic root of 55412381 is about 381.2433442894.

The spelling of 55412381 in words is "fifty-five million, four hundred twelve thousand, three hundred eighty-one".