1301407661 has 4 divisors (see below), whose sum is σ = 1302356892. Its totient is φ = 1300458432.

The previous prime is 1301407649. The next prime is 1301407711. The reversal of 1301407661 is 1667041031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1667041031 = 37 ⋅45055163.

It can be written as a sum of positive squares in 2 ways, for example, as 1242210025 + 59197636 = 35245^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301407661 - 2²⁶ = 1234298797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301407061) 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, 472556 + ... + 475301.

It is an arithmetic number, because the mean of its divisors is an integer number (325589223).

Almost surely, 2^1301407661 is an apocalyptic number.

It is an amenable number.

1301407661 is a deficient number, since it is larger than the sum of its proper divisors (949231).

1301407661 is an equidigital number, since it uses as much as digits as its factorization.

1301407661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949230.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1301407661 is about 36075.0282189772. The cubic root of 1301407661 is about 1091.7866669114.

Adding to 1301407661 its reverse (1667041031), we get a palindrome (2968448692).

The spelling of 1301407661 in words is "one billion, three hundred one million, four hundred seven thousand, six hundred sixty-one".