1231501 has 4 divisors (see below), whose sum is σ = 1233792. Its totient is φ = 1229212.

The previous prime is 1231487. The next prime is 1231511. The reversal of 1231501 is 1051321.

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.

It is a cyclic number.

It is not a de Polignac number, because 1231501 - 2⁵ = 1231469 is a prime.

It is a super-3 number, since 3×1231501³ = 5603063716966333503, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231511) 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, 150 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (308448).

2^1231501 is an apocalyptic number.

It is an amenable number.

1231501 is a deficient number, since it is larger than the sum of its proper divisors (2291).

1231501 is an equidigital number, since it uses as much as digits as its factorization.

1231501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1231501 is about 1109.7301473782. The cubic root of 1231501 is about 107.1876928119.

Adding to 1231501 its reverse (1051321), we get a palindrome (2282822).

It can be divided in two parts, 12 and 31501, that added together give a palindrome (31513).

The spelling of 1231501 in words is "one million, two hundred thirty-one thousand, five hundred one".