387121633 has 2 divisors, whose sum is σ = 387121634. Its totient is φ = 387121632.

The previous prime is 387121621. The next prime is 387121661. The reversal of 387121633 is 336121783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200307409 + 186814224 = 14153^2 + 13668^2 .

It is a cyclic number.

It is not a de Polignac number, because 387121633 - 2⁵ = 387121601 is a prime.

It is not a weakly prime, because it can be changed into another prime (387121663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193560816 + 193560817.

It is an arithmetic number, because the mean of its divisors is an integer number (193560817).

Almost surely, 2^387121633 is an apocalyptic number.

It is an amenable number.

387121633 is a deficient number, since it is larger than the sum of its proper divisors (1).

387121633 is an equidigital number, since it uses as much as digits as its factorization.

387121633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 387121633 is about 19675.4068064678. The cubic root of 387121633 is about 728.8125016833.

The spelling of 387121633 in words is "three hundred eighty-seven million, one hundred twenty-one thousand, six hundred thirty-three".