1261330603 has 8 divisors (see below), whose sum is σ = 1417415328. Its totient is φ = 1113682944.

The previous prime is 1261330597. The next prime is 1261330639. The reversal of 1261330603 is 3060331621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261330603 - 2¹³ = 1261322411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261330643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108950 + ... + 2109547.

It is an arithmetic number, because the mean of its divisors is an integer number (177176916).

Almost surely, 2^1261330603 is an apocalyptic number.

1261330603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1261330603 is a deficient number, since it is larger than the sum of its proper divisors (156084725).

1261330603 is a wasteful number, since it uses less digits than its factorization.

1261330603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218533.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 1261330603 is about 35515.2164994105. The cubic root of 1261330603 is about 1080.4623657542.

The spelling of 1261330603 in words is "one billion, two hundred sixty-one million, three hundred thirty thousand, six hundred three".