1261125603 has 24 divisors (see below), whose sum is σ = 1943534736. Its totient is φ = 785241600.

The previous prime is 1261125599. The next prime is 1261125611. The reversal of 1261125603 is 3065211621.

1261125603 is a `hidden beast` number, since 1 + 26 + 11 + 25 + 603 = 666.

It is not a de Polignac number, because 1261125603 - 2² = 1261125599 is a prime.

It is a super-2 number, since 2×1261125603² = 3180875573084227218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261125623) 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 23 ways as a sum of consecutive naturals, for example, 11418 + ... + 51503.

It is an arithmetic number, because the mean of its divisors is an integer number (80980614).

Almost surely, 2^1261125603 is an apocalyptic number.

1261125603 is a deficient number, since it is larger than the sum of its proper divisors (682409133).

1261125603 is a wasteful number, since it uses less digits than its factorization.

1261125603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63075 (or 63072 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1261125603 is about 35512.3302952651. The cubic root of 1261125603 is about 1080.4038278935.

The spelling of 1261125603 in words is "one billion, two hundred sixty-one million, one hundred twenty-five thousand, six hundred three".