1230513661 has 4 divisors (see below), whose sum is σ = 1325168572. Its totient is φ = 1135858752.

The previous prime is 1230513649. The next prime is 1230513673. The reversal of 1230513661 is 1663150321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1663150321 = 7 ⋅237592903.

It is an interprime number because it is at equal distance from previous prime (1230513649) and next prime (1230513673).

It can be written as a sum of positive squares in 2 ways, for example, as 670292100 + 560221561 = 25890^2 + 23669^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230513661 - 2⁵ = 1230513629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230513611) 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, 47327436 + ... + 47327461.

It is an arithmetic number, because the mean of its divisors is an integer number (331292143).

Almost surely, 2^1230513661 is an apocalyptic number.

It is an amenable number.

1230513661 is a deficient number, since it is larger than the sum of its proper divisors (94654911).

1230513661 is an equidigital number, since it uses as much as digits as its factorization.

1230513661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94654910.

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

The square root of 1230513661 is about 35078.6781535451. The cubic root of 1230513661 is about 1071.5903973331.

Adding to 1230513661 its reverse (1663150321), we get a palindrome (2893663982).

The spelling of 1230513661 in words is "one billion, two hundred thirty million, five hundred thirteen thousand, six hundred sixty-one".