1423651261 has 4 divisors (see below), whose sum is σ = 1431604800. Its totient is φ = 1415697724.

The previous prime is 1423651259. The next prime is 1423651279. The reversal of 1423651261 is 1621563241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1423651261 - 2¹ = 1423651259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423651231) 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, 3976501 + ... + 3976858.

It is an arithmetic number, because the mean of its divisors is an integer number (357901200).

Almost surely, 2^1423651261 is an apocalyptic number.

It is an amenable number.

1423651261 is a deficient number, since it is larger than the sum of its proper divisors (7953539).

1423651261 is an equidigital number, since it uses as much as digits as its factorization.

1423651261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7953538.

The product of its digits is 8640, while the sum is 31.

The square root of 1423651261 is about 37731.3034627748. The cubic root of 1423651261 is about 1124.9534166061.

The spelling of 1423651261 in words is "one billion, four hundred twenty-three million, six hundred fifty-one thousand, two hundred sixty-one".