1205034399981 has 20 divisors (see below), whose sum is σ = 1800470114784. Its totient is φ = 803196945000.

The previous prime is 1205034399911. The next prime is 1205034399991. The reversal of 1205034399981 is 1899934305021.

1205034399981 is a `hidden beast` number, since 1 + 2 + 0 + 503 + 43 + 9 + 9 + 98 + 1 = 666.

It is not a de Polignac number, because 1205034399981 - 2⁷ = 1205034399853 is a prime.

It is a super-2 number, since 2×1205034399981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205034399911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1063545 + ... + 1881806.

Almost surely, 2^{1205034399981} is an apocalyptic number.

It is an amenable number.

1205034399981 is a deficient number, since it is larger than the sum of its proper divisors (595435714803).

1205034399981 is an equidigital number, since it uses as much as digits as its factorization.

1205034399981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950414 (or 2950405 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 1205034399981 in words is "one trillion, two hundred five billion, thirty-four million, three hundred ninety-nine thousand, nine hundred eighty-one".