2131397 has 4 divisors (see below), whose sum is σ = 2135616. Its totient is φ = 2127180.

The previous prime is 2131373. The next prime is 2131399. The reversal of 2131397 is 7931312.

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 2131397 - 2⁸ = 2131141 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 (2131399) 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, 1229 + ... + 2402.

It is an arithmetic number, because the mean of its divisors is an integer number (533904).

2^2131397 is an apocalyptic number.

It is an amenable number.

2131397 is a deficient number, since it is larger than the sum of its proper divisors (4219).

2131397 is an equidigital number, since it uses as much as digits as its factorization.

2131397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218.

The product of its digits is 1134, while the sum is 26.

The square root of 2131397 is about 1459.9304777968. The cubic root of 2131397 is about 128.6929580477.

The spelling of 2131397 in words is "two million, one hundred thirty-one thousand, three hundred ninety-seven".