1821492151 has 4 divisors (see below), whose sum is σ = 1823159752. Its totient is φ = 1819824552.

The previous prime is 1821492143. The next prime is 1821492193. The reversal of 1821492151 is 1512941281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1512941281 = 29 ⋅52170389.

It is a cyclic number.

It is not a de Polignac number, because 1821492151 - 2³ = 1821492143 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 (1821192151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832161 + ... + 834346.

It is an arithmetic number, because the mean of its divisors is an integer number (455789938).

Almost surely, 2^1821492151 is an apocalyptic number.

1821492151 is a deficient number, since it is larger than the sum of its proper divisors (1667601).

1821492151 is a wasteful number, since it uses less digits than its factorization.

1821492151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667600.

The product of its digits is 5760, while the sum is 34.

The square root of 1821492151 is about 42678.9427118339. The cubic root of 1821492151 is about 1221.2627235563.

The spelling of 1821492151 in words is "one billion, eight hundred twenty-one million, four hundred ninety-two thousand, one hundred fifty-one".