1231354545 has 24 divisors (see below), whose sum is σ = 1979565888. Its totient is φ = 653604000.

The previous prime is 1231354507. The next prime is 1231354567. The reversal of 1231354545 is 5454531321.

It is not a de Polignac number, because 1231354545 - 2⁷ = 1231354417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 944364 + ... + 945666.

It is an arithmetic number, because the mean of its divisors is an integer number (82481912).

Almost surely, 2^1231354545 is an apocalyptic number.

1231354545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231354545 is a deficient number, since it is larger than the sum of its proper divisors (748211343).

1231354545 is an equidigital number, since it uses as much as digits as its factorization.

1231354545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813 (or 1562 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

The square root of 1231354545 is about 35090.6617919925. The cubic root of 1231354545 is about 1071.8344358110.

Adding to 1231354545 its reverse (5454531321), we get a palindrome (6685885866).

The spelling of 1231354545 in words is "one billion, two hundred thirty-one million, three hundred fifty-four thousand, five hundred forty-five".