1290279049 has 8 divisors (see below), whose sum is σ = 1337254920. Its totient is φ = 1243468800.

The previous prime is 1290279031. The next prime is 1290279071. The reversal of 1290279049 is 9409720921.

It can be written as a sum of positive squares in 4 ways, for example, as 120297024 + 1169982025 = 10968^2 + 34205^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1290279049 - 2²⁵ = 1256724617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290278996 and 1290279014.

It is not an unprimeable number, because it can be changed into a prime (1290279079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25432 + ... + 56809.

It is an arithmetic number, because the mean of its divisors is an integer number (167156865).

Almost surely, 2^1290279049 is an apocalyptic number.

It is an amenable number.

1290279049 is a deficient number, since it is larger than the sum of its proper divisors (46975871).

1290279049 is an equidigital number, since it uses as much as digits as its factorization.

1290279049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82811.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1290279049 is about 35920.4544653878. The cubic root of 1290279049 is about 1088.6657211217.

The spelling of 1290279049 in words is "one billion, two hundred ninety million, two hundred seventy-nine thousand, forty-nine".