7131997 has 4 divisors (see below), whose sum is σ = 7158780. Its totient is φ = 7105216.

The previous prime is 7131989. The next prime is 7132019. The reversal of 7131997 is 7991317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7991317 = 149 ⋅53633.

It can be written as a sum of positive squares in 2 ways, for example, as 811801 + 6320196 = 901^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 7131997 - 2³ = 7131989 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 (7131947) 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, 12988 + ... + 13525.

It is an arithmetic number, because the mean of its divisors is an integer number (1789695).

Almost surely, 2^7131997 is an apocalyptic number.

It is an amenable number.

7131997 is a deficient number, since it is larger than the sum of its proper divisors (26783).

7131997 is a wasteful number, since it uses less digits than its factorization.

7131997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26782.

The product of its digits is 11907, while the sum is 37.

The square root of 7131997 is about 2670.5798995724. The cubic root of 7131997 is about 192.4880253416.

It can be divided in two parts, 7131 and 997, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 7131997 in words is "seven million, one hundred thirty-one thousand, nine hundred ninety-seven".