1261602543 has 8 divisors (see below), whose sum is σ = 1686958000. Its totient is φ = 838657728.

The previous prime is 1261602539. The next prime is 1261602553. The reversal of 1261602543 is 3452061621.

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

It is not a de Polignac number, because 1261602543 - 2² = 1261602539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261602543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261602523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601438 + ... + 603531.

It is an arithmetic number, because the mean of its divisors is an integer number (210869750).

Almost surely, 2^1261602543 is an apocalyptic number.

1261602543 is a deficient number, since it is larger than the sum of its proper divisors (425355457).

1261602543 is a wasteful number, since it uses less digits than its factorization.

1261602543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205321.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1261602543 is about 35519.0447928995. The cubic root of 1261602543 is about 1080.5400085815.

The spelling of 1261602543 in words is "one billion, two hundred sixty-one million, six hundred two thousand, five hundred forty-three".