1231537147 has 2 divisors, whose sum is σ = 1231537148. Its totient is φ = 1231537146.

The previous prime is 1231537141. The next prime is 1231537183. The reversal of 1231537147 is 7417351321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231537147 - 2⁷ = 1231537019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231537141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615768573 + 615768574.

It is an arithmetic number, because the mean of its divisors is an integer number (615768574).

Almost surely, 2^1231537147 is an apocalyptic number.

1231537147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231537147 is an equidigital number, since it uses as much as digits as its factorization.

1231537147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 34.

The square root of 1231537147 is about 35093.2635558450. The cubic root of 1231537147 is about 1071.8874152551.

Adding to 1231537147 its reverse (7417351321), we get a palindrome (8648888468).

The spelling of 1231537147 in words is "one billion, two hundred thirty-one million, five hundred thirty-seven thousand, one hundred forty-seven".