387775481 has 2 divisors, whose sum is σ = 387775482. Its totient is φ = 387775480.

The previous prime is 387775477. The next prime is 387775483. The reversal of 387775481 is 184577783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387735481 + 40000 = 19691^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 387775481 - 2² = 387775477 is a prime.

It is a super-2 number, since 2×387775481² = 300739647329562722, which contains 22 as substring.

Together with 387775483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (387775483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193887740 + 193887741.

It is an arithmetic number, because the mean of its divisors is an integer number (193887741).

Almost surely, 2^387775481 is an apocalyptic number.

It is an amenable number.

387775481 is a deficient number, since it is larger than the sum of its proper divisors (1).

387775481 is an equidigital number, since it uses as much as digits as its factorization.

387775481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1317120, while the sum is 50.

The square root of 387775481 is about 19692.0156662542. The cubic root of 387775481 is about 729.2225920527. Note that the first 3 decimals are identical.

The spelling of 387775481 in words is "three hundred eighty-seven million, seven hundred seventy-five thousand, four hundred eighty-one".