1250661331 has 4 divisors (see below), whose sum is σ = 1267793752. Its totient is φ = 1233528912.

The previous prime is 1250661289. The next prime is 1250661341. The reversal of 1250661331 is 1331660521.

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

It is a cyclic number.

It is not a de Polignac number, because 1250661331 - 2¹¹ = 1250659283 is a prime.

It is a super-2 number, since 2×1250661331² = 3128307529717383122, which contains 22 as substring.

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 1250661331.

It is not an unprimeable number, because it can be changed into a prime (1250661341) 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, 8566101 + ... + 8566246.

It is an arithmetic number, because the mean of its divisors is an integer number (316948438).

Almost surely, 2^1250661331 is an apocalyptic number.

1250661331 is a deficient number, since it is larger than the sum of its proper divisors (17132421).

1250661331 is an equidigital number, since it uses as much as digits as its factorization.

1250661331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17132420.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1250661331 is about 35364.6904553115. The cubic root of 1250661331 is about 1077.4072841162.

It can be divided in two parts, 12506 and 61331, that added together give a palindrome (73837).

The spelling of 1250661331 in words is "one billion, two hundred fifty million, six hundred sixty-one thousand, three hundred thirty-one".