1261086241205 has 64 divisors (see below), whose sum is σ = 1795211002368. Its totient is φ = 832469667840.

The previous prime is 1261086241201. The next prime is 1261086241241. The reversal of 1261086241205 is 5021426801621.

It is a happy number.

It is not a de Polignac number, because 1261086241205 - 2² = 1261086241201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261086241201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 104449049 + ... + 104461121.

It is an arithmetic number, because the mean of its divisors is an integer number (28050171912).

Almost surely, 2^{1261086241205} is an apocalyptic number.

It is an amenable number.

1261086241205 is a deficient number, since it is larger than the sum of its proper divisors (534124761163).

1261086241205 is a wasteful number, since it uses less digits than its factorization.

1261086241205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13086.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 1261086241205 in words is "one trillion, two hundred sixty-one billion, eighty-six million, two hundred forty-one thousand, two hundred five".