1821152097 has 24 divisors (see below), whose sum is σ = 2686184904. Its totient is φ = 1188670464.

The previous prime is 1821152093. The next prime is 1821152101. The reversal of 1821152097 is 7902511281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1821152093) and next prime (1821152101).

It can be written as a sum of positive squares in 4 ways, for example, as 390497121 + 1430654976 = 19761^2 + 37824^2 .

It is not a de Polignac number, because 1821152097 - 2² = 1821152093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1821152093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79893 + ... + 100125.

It is an arithmetic number, because the mean of its divisors is an integer number (111924371).

Almost surely, 2^1821152097 is an apocalyptic number.

It is an amenable number.

1821152097 is a deficient number, since it is larger than the sum of its proper divisors (865032807).

1821152097 is a wasteful number, since it uses less digits than its factorization.

1821152097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20449 (or 20446 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1821152097 is about 42674.9586643034. The cubic root of 1821152097 is about 1221.1867197297.

The spelling of 1821152097 in words is "one billion, eight hundred twenty-one million, one hundred fifty-two thousand, ninety-seven".