531403991091 has 6 divisors (see below), whose sum is σ = 767583542700. Its totient is φ = 354269327388.

The previous prime is 531403991089. The next prime is 531403991101. The reversal of 531403991091 is 190199304135.

531403991091 is a `hidden beast` number, since 53 + 1 + 403 + 99 + 109 + 1 = 666.

It is not a de Polignac number, because 531403991091 - 2¹ = 531403991089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531403991191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29522443941 + ... + 29522443958.

It is an arithmetic number, because the mean of its divisors is an integer number (127930590450).

Almost surely, 2^531403991091 is an apocalyptic number.

531403991091 is a deficient number, since it is larger than the sum of its proper divisors (236179551609).

531403991091 is a wasteful number, since it uses less digits than its factorization.

531403991091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59044887905 (or 59044887902 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The spelling of 531403991091 in words is "five hundred thirty-one billion, four hundred three million, nine hundred ninety-one thousand, ninety-one".