1251486941 has 4 divisors (see below), whose sum is σ = 1253569884. Its totient is φ = 1249404000.

The previous prime is 1251486931. The next prime is 1251486949. The reversal of 1251486941 is 1496841521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1496841521 = 7 ⋅213834503.

It can be written as a sum of positive squares in 2 ways, for example, as 696696025 + 554790916 = 26395^2 + 23554^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251486941 - 2⁶ = 1251486877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251486949) 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, 1040570 + ... + 1041771.

It is an arithmetic number, because the mean of its divisors is an integer number (313392471).

Almost surely, 2^1251486941 is an apocalyptic number.

It is an amenable number.

1251486941 is a deficient number, since it is larger than the sum of its proper divisors (2082943).

1251486941 is an equidigital number, since it uses as much as digits as its factorization.

1251486941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082942.

The product of its digits is 69120, while the sum is 41.

The square root of 1251486941 is about 35376.3613306965. The cubic root of 1251486941 is about 1077.6443113973.

The spelling of 1251486941 in words is "one billion, two hundred fifty-one million, four hundred eighty-six thousand, nine hundred forty-one".