1306650421 has 4 divisors (see below), whose sum is σ = 1306831500. Its totient is φ = 1306469344.

The previous prime is 1306650409. The next prime is 1306650427. The reversal of 1306650421 is 1240566031.

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 346518225 + 960132196 = 18615^2 + 30986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306650421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1306650421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306650427) 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, 79246 + ... + 94303.

It is an arithmetic number, because the mean of its divisors is an integer number (326707875).

Almost surely, 2^1306650421 is an apocalyptic number.

It is an amenable number.

1306650421 is a deficient number, since it is larger than the sum of its proper divisors (181079).

1306650421 is an equidigital number, since it uses as much as digits as its factorization.

1306650421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181078.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1306650421 is about 36147.6198524882. The cubic root of 1306650421 is about 1093.2508010669.

The spelling of 1306650421 in words is "one billion, three hundred six million, six hundred fifty thousand, four hundred twenty-one".