1280279961 has 9 divisors (see below), whose sum is σ = 1849448341. Its totient is φ = 853448412.

The previous prime is 1280279941. The next prime is 1280279969. The reversal of 1280279961 is 1699720821.

The square root of 1280279961 is 35781.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1280279961 - 2⁵ = 1280279929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280279969) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 101380 + ... + 113306.

Almost surely, 2^1280279961 is an apocalyptic number.

1280279961 is the 35781-st square number.

1280279961 is the 17891-st centered octagonal number.

It is an amenable number.

1280279961 is a deficient number, since it is larger than the sum of its proper divisors (569168380).

1280279961 is an frugal number, since it uses more digits than its factorization.

1280279961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23860 (or 11930 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The cubic root of 1280279961 is about 1085.8462003539.

The spelling of 1280279961 in words is "one billion, two hundred eighty million, two hundred seventy-nine thousand, nine hundred sixty-one".