55316381 has 2 divisors, whose sum is σ = 55316382. Its totient is φ = 55316380.

The previous prime is 55316363. The next prime is 55316383. The reversal of 55316381 is 18361355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49984900 + 5331481 = 7070^2 + 2309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55316381 is a prime.

It is a super-2 number, since 2×55316381² = 6119804013874322, which contains 22 as substring.

Together with 55316383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55316383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27658190 + 27658191.

It is an arithmetic number, because the mean of its divisors is an integer number (27658191).

Almost surely, 2^55316381 is an apocalyptic number.

It is an amenable number.

55316381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55316381 is an equidigital number, since it uses as much as digits as its factorization.

55316381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 55316381 is about 7437.4983025208. The cubic root of 55316381 is about 381.0230534660.

The spelling of 55316381 in words is "fifty-five million, three hundred sixteen thousand, three hundred eighty-one".