1918292729391 has 24 divisors (see below), whose sum is σ = 2846121838560. Its totient is φ = 1244137841856.

The previous prime is 1918292729377. The next prime is 1918292729459. The reversal of 1918292729391 is 1939272928191.

1918292729391 is a `hidden beast` number, since 1 + 91 + 8 + 2 + 92 + 72 + 9 + 391 = 666.

It is not a de Polignac number, because 1918292729391 - 2⁵ = 1918292729359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918292729291) 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, 2248270 + ... + 2981828.

It is an arithmetic number, because the mean of its divisors is an integer number (118588409940).

Almost surely, 2^{1918292729391} is an apocalyptic number.

1918292729391 is a deficient number, since it is larger than the sum of its proper divisors (927829109169).

1918292729391 is a wasteful number, since it uses less digits than its factorization.

1918292729391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741455 (or 741452 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The spelling of 1918292729391 in words is "one trillion, nine hundred eighteen billion, two hundred ninety-two million, seven hundred twenty-nine thousand, three hundred ninety-one".