18477313 has 2 divisors, whose sum is σ = 18477314. Its totient is φ = 18477312.

The previous prime is 18477311. The next prime is 18477343. The reversal of 18477313 is 31377481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 1896129 = 4072^2 + 1377^2 .

It is a cyclic number.

It is not a de Polignac number, because 18477313 - 2¹ = 18477311 is a prime.

It is a super-2 number, since 2×18477313² = 682822191399938, which contains 22 as substring.

Together with 18477311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18477311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9238656 + 9238657.

It is an arithmetic number, because the mean of its divisors is an integer number (9238657).

Almost surely, 2^18477313 is an apocalyptic number.

It is an amenable number.

18477313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18477313 is an equidigital number, since it uses as much as digits as its factorization.

18477313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 18477313 is about 4298.5245142956. The cubic root of 18477313 is about 264.3704672212.

The spelling of 18477313 in words is "eighteen million, four hundred seventy-seven thousand, three hundred thirteen".