381298921 has 4 divisors (see below), whose sum is σ = 389411712. Its totient is φ = 373186132.

The previous prime is 381298919. The next prime is 381298979. The reversal of 381298921 is 129892183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129892183 = 313 ⋅414991.

It is a cyclic number.

It is not a de Polignac number, because 381298921 - 2¹ = 381298919 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381298901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4056325 + ... + 4056418.

It is an arithmetic number, because the mean of its divisors is an integer number (97352928).

Almost surely, 2^381298921 is an apocalyptic number.

It is an amenable number.

381298921 is a deficient number, since it is larger than the sum of its proper divisors (8112791).

381298921 is an equidigital number, since it uses as much as digits as its factorization.

381298921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8112790.

The product of its digits is 62208, while the sum is 43.

The square root of 381298921 is about 19526.8768880228. The cubic root of 381298921 is about 725.1399942106.

The spelling of 381298921 in words is "three hundred eighty-one million, two hundred ninety-eight thousand, nine hundred twenty-one".