1055197985309 has 24 divisors (see below), whose sum is σ = 1148459055552. Its totient is φ = 969047089920.

The previous prime is 1055197985293. The next prime is 1055197985327. The reversal of 1055197985309 is 9035897915501.

It is not a de Polignac number, because 1055197985309 - 2⁴ = 1055197985293 is a prime.

It is a super-2 number, since 2×1055197985309² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055197985609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154649672 + ... + 154656494.

It is an arithmetic number, because the mean of its divisors is an integer number (47852460648).

Almost surely, 2^{1055197985309} is an apocalyptic number.

It is an amenable number.

1055197985309 is a deficient number, since it is larger than the sum of its proper divisors (93261070243).

1055197985309 is a wasteful number, since it uses less digits than its factorization.

1055197985309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11397 (or 11384 counting only the distinct ones).

The product of its (nonzero) digits is 15309000, while the sum is 62.

The spelling of 1055197985309 in words is "one trillion, fifty-five billion, one hundred ninety-seven million, nine hundred eighty-five thousand, three hundred nine".