1231687151 has 2 divisors, whose sum is σ = 1231687152. Its totient is φ = 1231687150.

The previous prime is 1231687147. The next prime is 1231687153. The reversal of 1231687151 is 1517861321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231687151 - 2² = 1231687147 is a prime.

Together with 1231687153, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231687153) 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, 615843575 + 615843576.

It is an arithmetic number, because the mean of its divisors is an integer number (615843576).

Almost surely, 2^1231687151 is an apocalyptic number.

1231687151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231687151 is an equidigital number, since it uses as much as digits as its factorization.

1231687151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 1231687151 is about 35095.4007100646. The cubic root of 1231687151 is about 1071.9309329226.

The spelling of 1231687151 in words is "one billion, two hundred thirty-one million, six hundred eighty-seven thousand, one hundred fifty-one".