1261477885 has 32 divisors (see below), whose sum is σ = 1633370112. Its totient is φ = 933387840.

The previous prime is 1261477883. The next prime is 1261477913. The reversal of 1261477885 is 5887741621.

It is not a de Polignac number, because 1261477885 - 2¹ = 1261477883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261477883) 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 31 ways as a sum of consecutive naturals, for example, 311242 + ... + 315268.

It is an arithmetic number, because the mean of its divisors is an integer number (51042816).

Almost surely, 2^1261477885 is an apocalyptic number.

It is an amenable number.

1261477885 is a deficient number, since it is larger than the sum of its proper divisors (371892227).

1261477885 is a wasteful number, since it uses less digits than its factorization.

1261477885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153.

The product of its digits is 752640, while the sum is 49.

The square root of 1261477885 is about 35517.2899444763. The cubic root of 1261477885 is about 1080.5044182936.

The spelling of 1261477885 in words is "one billion, two hundred sixty-one million, four hundred seventy-seven thousand, eight hundred eighty-five".