1545143231 has 4 divisors (see below), whose sum is σ = 1545897912. Its totient is φ = 1544388552.

The previous prime is 1545143221. The next prime is 1545143267. The reversal of 1545143231 is 1323415451.

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

It is a cyclic number.

It is not a de Polignac number, because 1545143231 - 2²⁶ = 1478034367 is a prime.

It is a super-2 number, since 2×1545143231² = 4774935208610238722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1545143194 and 1545143203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1545143221) 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, 374261 + ... + 378366.

It is an arithmetic number, because the mean of its divisors is an integer number (386474478).

Almost surely, 2^1545143231 is an apocalyptic number.

1545143231 is a deficient number, since it is larger than the sum of its proper divisors (754681).

1545143231 is an equidigital number, since it uses as much as digits as its factorization.

1545143231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754680.

The product of its digits is 7200, while the sum is 29.

The square root of 1545143231 is about 39308.3099484066. The cubic root of 1545143231 is about 1156.0845072479.

Adding to 1545143231 its reverse (1323415451), we get a palindrome (2868558682).

The spelling of 1545143231 in words is "one billion, five hundred forty-five million, one hundred forty-three thousand, two hundred thirty-one".