1447921261 has 2 divisors, whose sum is σ = 1447921262. Its totient is φ = 1447921260.

The previous prime is 1447921253. The next prime is 1447921289. The reversal of 1447921261 is 1621297441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1297368361 + 150552900 = 36019^2 + 12270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1447921261 - 2³ = 1447921253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1447921261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1447921291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 723960630 + 723960631.

It is an arithmetic number, because the mean of its divisors is an integer number (723960631).

Almost surely, 2^1447921261 is an apocalyptic number.

It is an amenable number.

1447921261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1447921261 is an equidigital number, since it uses as much as digits as its factorization.

1447921261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 1447921261 is about 38051.5605593253. The cubic root of 1447921261 is about 1131.3100583846.

The spelling of 1447921261 in words is "one billion, four hundred forty-seven million, nine hundred twenty-one thousand, two hundred sixty-one".