7131919905 has 48 divisors (see below), whose sum is σ = 13510545984. Its totient is φ = 3451559040.

The previous prime is 7131919903. The next prime is 7131919939. The reversal of 7131919905 is 5099191317.

It is a happy number.

It is not a de Polignac number, because 7131919905 - 2¹ = 7131919903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7131919903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 262782 + ... + 288648.

It is an arithmetic number, because the mean of its divisors is an integer number (281469708).

Almost surely, 2^7131919905 is an apocalyptic number.

It is an amenable number.

7131919905 is a deficient number, since it is larger than the sum of its proper divisors (6378626079).

7131919905 is a wasteful number, since it uses less digits than its factorization.

7131919905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26446 (or 26443 counting only the distinct ones).

The product of its (nonzero) digits is 76545, while the sum is 45.

The square root of 7131919905 is about 84450.6951125922. The cubic root of 7131919905 is about 1924.8733175755.

The spelling of 7131919905 in words is "seven billion, one hundred thirty-one million, nine hundred nineteen thousand, nine hundred five".