2102131601 has 2 divisors, whose sum is σ = 2102131602. Its totient is φ = 2102131600.

The previous prime is 2102131597. The next prime is 2102131627. The reversal of 2102131601 is 1061312012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1064325376 + 1037806225 = 32624^2 + 32215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102131601 - 2² = 2102131597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2102131601.

It is not a weakly prime, because it can be changed into another prime (2102131501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051065800 + 1051065801.

It is an arithmetic number, because the mean of its divisors is an integer number (1051065801).

Almost surely, 2^2102131601 is an apocalyptic number.

It is an amenable number.

2102131601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102131601 is an equidigital number, since it uses as much as digits as its factorization.

2102131601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2102131601 is about 45849.0087242898. The cubic root of 2102131601 is about 1281.0123016164.

Adding to 2102131601 its reverse (1061312012), we get a palindrome (3163443613).

The spelling of 2102131601 in words is "two billion, one hundred two million, one hundred thirty-one thousand, six hundred one".