381629621 has 4 divisors (see below), whose sum is σ = 382388832. Its totient is φ = 380870412.

The previous prime is 381629609. The next prime is 381629629. The reversal of 381629621 is 126926183.

It is a happy number.

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: 126926183 = 31 ⋅4094393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381629621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381629629) 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, 378851 + ... + 379856.

It is an arithmetic number, because the mean of its divisors is an integer number (95597208).

Almost surely, 2^381629621 is an apocalyptic number.

It is an amenable number.

381629621 is a deficient number, since it is larger than the sum of its proper divisors (759211).

381629621 is an equidigital number, since it uses as much as digits as its factorization.

381629621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759210.

The product of its digits is 31104, while the sum is 38.

The square root of 381629621 is about 19535.3428687597. The cubic root of 381629621 is about 725.3495712546.

The spelling of 381629621 in words is "three hundred eighty-one million, six hundred twenty-nine thousand, six hundred twenty-one".