1231250501 has 4 divisors (see below), whose sum is σ = 1325962092. Its totient is φ = 1136538912.

The previous prime is 1231250429. The next prime is 1231250533. The reversal of 1231250501 is 1050521321.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 759057601 + 472192900 = 27551^2 + 21730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231250501 - 2¹⁴ = 1231234117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231250561) 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 3 ways as a sum of consecutive naturals, for example, 47355776 + ... + 47355801.

It is an arithmetic number, because the mean of its divisors is an integer number (331490523).

Almost surely, 2^1231250501 is an apocalyptic number.

It is an amenable number.

1231250501 is a deficient number, since it is larger than the sum of its proper divisors (94711591).

1231250501 is an equidigital number, since it uses as much as digits as its factorization.

1231250501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94711590.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1231250501 is about 35089.1792579992. The cubic root of 1231250501 is about 1071.8042465414.

Adding to 1231250501 its reverse (1050521321), we get a palindrome (2281771822).

The spelling of 1231250501 in words is "one billion, two hundred thirty-one million, two hundred fifty thousand, five hundred one".