1824145921 has 4 divisors (see below), whose sum is σ = 1964464852. Its totient is φ = 1683826992.

The previous prime is 1824145919. The next prime is 1824145933. The reversal of 1824145921 is 1295414281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 999824400 + 824321521 = 31620^2 + 28711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1824145921 - 2¹ = 1824145919 is a prime.

It is a super-2 number, since 2×1824145921² = 6655016682201876482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1824145321) 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, 70159446 + ... + 70159471.

It is an arithmetic number, because the mean of its divisors is an integer number (491116213).

Almost surely, 2^1824145921 is an apocalyptic number.

It is an amenable number.

1824145921 is a deficient number, since it is larger than the sum of its proper divisors (140318931).

1824145921 is a wasteful number, since it uses less digits than its factorization.

1824145921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140318930.

The product of its digits is 23040, while the sum is 37.

The square root of 1824145921 is about 42710.0213181871. The cubic root of 1824145921 is about 1221.8555301577.

The spelling of 1824145921 in words is "one billion, eight hundred twenty-four million, one hundred forty-five thousand, nine hundred twenty-one".