1231345154 has 12 divisors (see below), whose sum is σ = 2000025666. Its totient is φ = 568312992.

The previous prime is 1231345147. The next prime is 1231345183. The reversal of 1231345154 is 4515431321.

It can be written as a sum of positive squares in 3 ways, for example, as 889649929 + 341695225 = 29827^2 + 18485^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1821179 + ... + 1821854.

Almost surely, 2^1231345154 is an apocalyptic number.

1231345154 is a deficient number, since it is larger than the sum of its proper divisors (768680512).

1231345154 is a wasteful number, since it uses less digits than its factorization.

1231345154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643061 (or 3643048 counting only the distinct ones).

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

The square root of 1231345154 is about 35090.5279812088. The cubic root of 1231345154 is about 1071.8317110007.

Adding to 1231345154 its reverse (4515431321), we get a palindrome (5746776475).

The spelling of 1231345154 in words is "one billion, two hundred thirty-one million, three hundred forty-five thousand, one hundred fifty-four".