1231203641 has 4 divisors (see below), whose sum is σ = 1231763712. Its totient is φ = 1230643572.

The previous prime is 1231203583. The next prime is 1231203653. The reversal of 1231203641 is 1463021321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1463021321 = 2411 ⋅606811.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231203641 is a prime.

It is a super-2 number, since 2×1231203641² = 3031724811223313762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231203691) 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, 276725 + ... + 281138.

It is an arithmetic number, because the mean of its divisors is an integer number (307940928).

Almost surely, 2^1231203641 is an apocalyptic number.

It is an amenable number.

1231203641 is a deficient number, since it is larger than the sum of its proper divisors (560071).

1231203641 is an equidigital number, since it uses as much as digits as its factorization.

1231203641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560070.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1231203641 is about 35088.5115244292. The cubic root of 1231203641 is about 1071.7906491502.

Adding to 1231203641 its reverse (1463021321), we get a palindrome (2694224962).

The spelling of 1231203641 in words is "one billion, two hundred thirty-one million, two hundred three thousand, six hundred forty-one".