2131720351 has 2 divisors, whose sum is σ = 2131720352. Its totient is φ = 2131720350.

The previous prime is 2131720343. The next prime is 2131720361. The reversal of 2131720351 is 1530271312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131720351 - 2³ = 2131720343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131720361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065860175 + 1065860176.

It is an arithmetic number, because the mean of its divisors is an integer number (1065860176).

Almost surely, 2^2131720351 is an apocalyptic number.

2131720351 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131720351 is an equidigital number, since it uses as much as digits as its factorization.

2131720351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 2131720351 is about 46170.5571874544. The cubic root of 2131720351 is about 1286.9946565630.

Adding to 2131720351 its reverse (1530271312), we get a palindrome (3661991663).

The spelling of 2131720351 in words is "two billion, one hundred thirty-one million, seven hundred twenty thousand, three hundred fifty-one".