991804154701 has 4 divisors (see below), whose sum is σ = 1003753602432. Its totient is φ = 979854706972.

The previous prime is 991804154699. The next prime is 991804154729. The reversal of 991804154701 is 107451408199.

991804154701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 991804154701 - 2¹ = 991804154699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991804154791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5974723741 + ... + 5974723906.

It is an arithmetic number, because the mean of its divisors is an integer number (250938400608).

Almost surely, 2^991804154701 is an apocalyptic number.

It is an amenable number.

991804154701 is a deficient number, since it is larger than the sum of its proper divisors (11949447731).

991804154701 is a wasteful number, since it uses less digits than its factorization.

991804154701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11949447730.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 991804154701 in words is "nine hundred ninety-one billion, eight hundred four million, one hundred fifty-four thousand, seven hundred one".