1231332501 has 16 divisors (see below), whose sum is σ = 1879632000. Its totient is φ = 702375168.

The previous prime is 1231332463. The next prime is 1231332503. The reversal of 1231332501 is 1052331321.

It is not a de Polignac number, because 1231332501 - 2⁹ = 1231331989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231332503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39576 + ... + 63473.

It is an arithmetic number, because the mean of its divisors is an integer number (117477000).

Almost surely, 2^1231332501 is an apocalyptic number.

It is an amenable number.

1231332501 is a deficient number, since it is larger than the sum of its proper divisors (648299499).

1231332501 is a wasteful number, since it uses less digits than its factorization.

1231332501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103628.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1231332501 is about 35090.3476899275. The cubic root of 1231332501 is about 1071.8280396951.

Adding to 1231332501 its reverse (1052331321), we get a palindrome (2283663822).

The spelling of 1231332501 in words is "one billion, two hundred thirty-one million, three hundred thirty-two thousand, five hundred one".