1191356056438 has 4 divisors (see below), whose sum is σ = 1787034084660. Its totient is φ = 595678028218.

The previous prime is 1191356056417. The next prime is 1191356056507. The reversal of 1191356056438 is 8346506531911.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 297839014108 + ... + 297839014111.

It is an arithmetic number, because the mean of its divisors is an integer number (446758521165).

Almost surely, 2^{1191356056438} is an apocalyptic number.

1191356056438 is a deficient number, since it is larger than the sum of its proper divisors (595678028222).

1191356056438 is an equidigital number, since it uses as much as digits as its factorization.

1191356056438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595678028221.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 1191356056438 in words is "one trillion, one hundred ninety-one billion, three hundred fifty-six million, fifty-six thousand, four hundred thirty-eight".