1300671661 has 4 divisors (see below), whose sum is σ = 1301837212. Its totient is φ = 1299506112.

The previous prime is 1300671629. The next prime is 1300671667. The reversal of 1300671661 is 1661760031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1661760031 = 2963 ⋅560837.

It can be written as a sum of positive squares in 2 ways, for example, as 412333636 + 888338025 = 20306^2 + 29805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1300671661 - 2⁵ = 1300671629 is a prime.

It is a super-3 number, since 3×1300671661³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300671667) 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, 581100 + ... + 583333.

It is an arithmetic number, because the mean of its divisors is an integer number (325459303).

Almost surely, 2^1300671661 is an apocalyptic number.

It is an amenable number.

1300671661 is a deficient number, since it is larger than the sum of its proper divisors (1165551).

1300671661 is a wasteful number, since it uses less digits than its factorization.

1300671661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165550.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1300671661 is about 36064.8258140810. The cubic root of 1300671661 is about 1091.5808112215.

The spelling of 1300671661 in words is "one billion, three hundred million, six hundred seventy-one thousand, six hundred sixty-one".