1279696445 has 4 divisors (see below), whose sum is σ = 1535635740. Its totient is φ = 1023757152.

The previous prime is 1279696421. The next prime is 1279696447. The reversal of 1279696445 is 5446969721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5446969721 = 36979 ⋅147299.

It can be written as a sum of positive squares in 2 ways, for example, as 869188324 + 410508121 = 29482^2 + 20261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279696445 - 2⁶ = 1279696381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279696447) 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, 127969640 + ... + 127969649.

It is an arithmetic number, because the mean of its divisors is an integer number (383908935).

Almost surely, 2^1279696445 is an apocalyptic number.

It is an amenable number.

1279696445 is a deficient number, since it is larger than the sum of its proper divisors (255939295).

1279696445 is an equidigital number, since it uses as much as digits as its factorization.

1279696445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255939294.

The product of its digits is 3265920, while the sum is 53.

The square root of 1279696445 is about 35772.8450783552. The cubic root of 1279696445 is about 1085.6812091188.

The spelling of 1279696445 in words is "one billion, two hundred seventy-nine million, six hundred ninety-six thousand, four hundred forty-five".