1231503101 has 8 divisors (see below), whose sum is σ = 1290879744. Its totient is φ = 1173523680.

The previous prime is 1231503089. The next prime is 1231503157. The reversal of 1231503101 is 1013051321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231503101 - 2¹⁸ = 1231240957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231503101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231503181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347501 + ... + 351026.

It is an arithmetic number, because the mean of its divisors is an integer number (161359968).

Almost surely, 2^1231503101 is an apocalyptic number.

It is an amenable number.

1231503101 is a deficient number, since it is larger than the sum of its proper divisors (59376643).

1231503101 is an equidigital number, since it uses as much as digits as its factorization.

1231503101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698611.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1231503101 is about 35092.7784736404. The cubic root of 1231503101 is about 1071.8775376764.

Adding to 1231503101 its reverse (1013051321), we get a palindrome (2244554422).

The spelling of 1231503101 in words is "one billion, two hundred thirty-one million, five hundred three thousand, one hundred one".