1189947177409 has 9 divisors (see below), whose sum is σ = 1255894103523. Its totient is φ = 1127298743352.

The previous prime is 1189947177407. The next prime is 1189947177487. The reversal of 1189947177409 is 9047717499811.

The square root of 1189947177409 is 1090847.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 105374898225 + 1084572279184 = 324615^2 + 1041428^2 .

It is not a de Polignac number, because 1189947177409 - 2¹ = 1189947177407 is a prime.

It is a super-2 number, since 2×1189947177409² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189947177401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20697387 + ... + 20754799.

Almost surely, 2^{1189947177409} is an apocalyptic number.

1189947177409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1189947177409 is the 1090847-th square number.

1189947177409 is the 545424-th centered octagonal number.

It is an amenable number.

1189947177409 is a deficient number, since it is larger than the sum of its proper divisors (65946926114).

1189947177409 is an frugal number, since it uses more digits than its factorization.

1189947177409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114864 (or 57432 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 67.

The spelling of 1189947177409 in words is "one trillion, one hundred eighty-nine billion, nine hundred forty-seven million, one hundred seventy-seven thousand, four hundred nine".