1264155123 has 48 divisors (see below), whose sum is σ = 2123744000. Its totient is φ = 654730560.

The previous prime is 1264155121. The next prime is 1264155143. The reversal of 1264155123 is 3215514621.

It is not a de Polignac number, because 1264155123 - 2¹ = 1264155121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1264155121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1267461 + ... + 1268457.

Almost surely, 2^1264155123 is an apocalyptic number.

1264155123 is a deficient number, since it is larger than the sum of its proper divisors (859588877).

1264155123 is a wasteful number, since it uses less digits than its factorization.

1264155123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1517 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1264155123 is about 35554.9591899639. The cubic root of 1264155123 is about 1081.2682640148.

Adding to 1264155123 its reverse (3215514621), we get a palindrome (4479669744).

The spelling of 1264155123 in words is "one billion, two hundred sixty-four million, one hundred fifty-five thousand, one hundred twenty-three".