1241325661 has 4 divisors (see below), whose sum is σ = 1261675324. Its totient is φ = 1220976000.

The previous prime is 1241325623. The next prime is 1241325671. The reversal of 1241325661 is 1665231421.

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 25060036 + 1216265625 = 5006^2 + 34875^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1241325661 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 (1241325671) 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, 10174740 + ... + 10174861.

It is an arithmetic number, because the mean of its divisors is an integer number (315418831).

Almost surely, 2^1241325661 is an apocalyptic number.

It is an amenable number.

1241325661 is a deficient number, since it is larger than the sum of its proper divisors (20349663).

1241325661 is an equidigital number, since it uses as much as digits as its factorization.

1241325661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20349662.

The product of its digits is 8640, while the sum is 31.

The square root of 1241325661 is about 35232.4518164717. The cubic root of 1241325661 is about 1074.7197859153.

The spelling of 1241325661 in words is "one billion, two hundred forty-one million, three hundred twenty-five thousand, six hundred sixty-one".