1231404545 has 48 divisors (see below), whose sum is σ = 1771450560. Its totient is φ = 818891136.

The previous prime is 1231404539. The next prime is 1231404557. The reversal of 1231404545 is 5454041321.

It is not a de Polignac number, because 1231404545 - 2⁶ = 1231404481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1885439 + ... + 1886091.

It is an arithmetic number, because the mean of its divisors is an integer number (36905220).

Almost surely, 2^1231404545 is an apocalyptic number.

It is an amenable number.

1231404545 is a deficient number, since it is larger than the sum of its proper divisors (540046015).

1231404545 is a wasteful number, since it uses less digits than its factorization.

1231404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1231404545 is about 35091.3742250143. The cubic root of 1231404545 is about 1071.8489431400.

Adding to 1231404545 its reverse (5454041321), we get a palindrome (6685445866).

The spelling of 1231404545 in words is "one billion, two hundred thirty-one million, four hundred four thousand, five hundred forty-five".