2131864649 has 2 divisors, whose sum is σ = 2131864650. Its totient is φ = 2131864648.

The previous prime is 2131864627. The next prime is 2131864663. The reversal of 2131864649 is 9464681312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1827990025 + 303874624 = 42755^2 + 17432^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131864649 - 2¹⁶ = 2131799113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131864949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065932324 + 1065932325.

It is an arithmetic number, because the mean of its divisors is an integer number (1065932325).

Almost surely, 2^2131864649 is an apocalyptic number.

It is an amenable number.

2131864649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131864649 is an equidigital number, since it uses as much as digits as its factorization.

2131864649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 2131864649 is about 46172.1198235472. The cubic root of 2131864649 is about 1287.0236951694.

The spelling of 2131864649 in words is "two billion, one hundred thirty-one million, eight hundred sixty-four thousand, six hundred forty-nine".