1201191928391 has 16 divisors (see below), whose sum is σ = 1542667897344. Its totient is φ = 909072150624.

The previous prime is 1201191928373. The next prime is 1201191928403. The reversal of 1201191928391 is 1938291911021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201191928391 - 2²⁶ = 1201124819527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201191928331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286952501 + ... + 286956686.

It is an arithmetic number, because the mean of its divisors is an integer number (96416743584).

Almost surely, 2^{1201191928391} is an apocalyptic number.

1201191928391 is a deficient number, since it is larger than the sum of its proper divisors (341475968953).

1201191928391 is a wasteful number, since it uses less digits than its factorization.

1201191928391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573909230.

The product of its (nonzero) digits is 69984, while the sum is 47.

The spelling of 1201191928391 in words is "one trillion, two hundred one billion, one hundred ninety-one million, nine hundred twenty-eight thousand, three hundred ninety-one".