1231137507 has 4 divisors (see below), whose sum is σ = 1641516680. Its totient is φ = 820758336.

The previous prime is 1231137487. The next prime is 1231137511. The reversal of 1231137507 is 7057311321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1231137507 - 2⁶ = 1231137443 is a prime.

It is a super-2 number, since 2×1231137507² = 3031399122284350098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231137577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205189582 + ... + 205189587.

It is an arithmetic number, because the mean of its divisors is an integer number (410379170).

Almost surely, 2^1231137507 is an apocalyptic number.

1231137507 is a deficient number, since it is larger than the sum of its proper divisors (410379173).

1231137507 is an equidigital number, since it uses as much as digits as its factorization.

1231137507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410379172.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 1231137507 is about 35087.5691235514. The cubic root of 1231137507 is about 1071.7714584251.

Adding to 1231137507 its reverse (7057311321), we get a palindrome (8288448828).

The spelling of 1231137507 in words is "one billion, two hundred thirty-one million, one hundred thirty-seven thousand, five hundred seven".