1545212321 has 2 divisors, whose sum is σ = 1545212322. Its totient is φ = 1545212320.

The previous prime is 1545212287. The next prime is 1545212323. The reversal of 1545212321 is 1232125451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1362421921 + 182790400 = 36911^2 + 13520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545212321 - 2¹⁴ = 1545195937 is a prime.

It is a super-2 number, since 2×1545212321² = 4775362233940414082, which contains 22 as substring.

Together with 1545212323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1545212323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772606160 + 772606161.

It is an arithmetic number, because the mean of its divisors is an integer number (772606161).

Almost surely, 2^1545212321 is an apocalyptic number.

It is an amenable number.

1545212321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545212321 is an equidigital number, since it uses as much as digits as its factorization.

1545212321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 1545212321 is about 39309.1887603904. The cubic root of 1545212321 is about 1156.1017381614.

Adding to 1545212321 its reverse (1232125451), we get a palindrome (2777337772).

The spelling of 1545212321 in words is "one billion, five hundred forty-five million, two hundred twelve thousand, three hundred twenty-one".