1300069721 has 4 divisors (see below), whose sum is σ = 1300454052. Its totient is φ = 1299685392.

The previous prime is 1300069657. The next prime is 1300069763. The reversal of 1300069721 is 1279600031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1279600031 = 29 ⋅44124139.

It can be written as a sum of positive squares in 2 ways, for example, as 770839696 + 529230025 = 27764^2 + 23005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1300069721 - 2⁶ = 1300069657 is a prime.

It is a super-2 number, since 2×1300069721² = 3380362558922035682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1300069321) 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, 187046 + ... + 193871.

It is an arithmetic number, because the mean of its divisors is an integer number (325113513).

Almost surely, 2^1300069721 is an apocalyptic number.

It is an amenable number.

1300069721 is a deficient number, since it is larger than the sum of its proper divisors (384331).

1300069721 is an equidigital number, since it uses as much as digits as its factorization.

1300069721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384330.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 1300069721 is about 36056.4795979863. The cubic root of 1300069721 is about 1091.4123937388.

Adding to 1300069721 its reverse (1279600031), we get a palindrome (2579669752).

The spelling of 1300069721 in words is "one billion, three hundred million, sixty-nine thousand, seven hundred twenty-one".