2051631287 has 2 divisors, whose sum is σ = 2051631288. Its totient is φ = 2051631286.

The previous prime is 2051631271. The next prime is 2051631311. The reversal of 2051631287 is 7821361502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2051631287 - 2⁴ = 2051631271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051631227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025815643 + 1025815644.

It is an arithmetic number, because the mean of its divisors is an integer number (1025815644).

Almost surely, 2^2051631287 is an apocalyptic number.

2051631287 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051631287 is an equidigital number, since it uses as much as digits as its factorization.

2051631287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2051631287 is about 45294.9366596312. The cubic root of 2051631287 is about 1270.6709594492.

Adding to 2051631287 its reverse (7821361502), we get a palindrome (9872992789).

The spelling of 2051631287 in words is "two billion, fifty-one million, six hundred thirty-one thousand, two hundred eighty-seven".