1231687153 has 2 divisors, whose sum is σ = 1231687154. Its totient is φ = 1231687152.

The previous prime is 1231687151. The next prime is 1231687157. The reversal of 1231687153 is 3517861321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 788037184 + 443649969 = 28072^2 + 21063^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231687153 - 2¹ = 1231687151 is a prime.

Together with 1231687151, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231687151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615843576 + 615843577.

It is an arithmetic number, because the mean of its divisors is an integer number (615843577).

Almost surely, 2^1231687153 is an apocalyptic number.

It is an amenable number.

1231687153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231687153 is an equidigital number, since it uses as much as digits as its factorization.

1231687153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 1231687153 is about 35095.4007385583. The cubic root of 1231687153 is about 1071.9309335028.

It can be divided in two parts, 123168 and 7153, that added together give a 4-th power (130321 = 19⁴).

The spelling of 1231687153 in words is "one billion, two hundred thirty-one million, six hundred eighty-seven thousand, one hundred fifty-three".