381000145821 has 4 divisors (see below), whose sum is σ = 508000194432. Its totient is φ = 254000097212.

The previous prime is 381000145793. The next prime is 381000145829. The reversal of 381000145821 is 128541000183.

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.

It is a cyclic number.

It is not a de Polignac number, because 381000145821 - 2²² = 380995951517 is a prime.

It is a super-2 number, since 2×381000145821² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381000145829) 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, 63500024301 + ... + 63500024306.

It is an arithmetic number, because the mean of its divisors is an integer number (127000048608).

Almost surely, 2^381000145821 is an apocalyptic number.

It is an amenable number.

381000145821 is a deficient number, since it is larger than the sum of its proper divisors (127000048611).

381000145821 is a wasteful number, since it uses less digits than its factorization.

381000145821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127000048610.

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 381000145821 in words is "three hundred eighty-one billion, one hundred forty-five thousand, eight hundred twenty-one".