1272661583 has 16 divisors (see below), whose sum is σ = 1357530240. Its totient is φ = 1191316896.

The previous prime is 1272661571. The next prime is 1272661589. The reversal of 1272661583 is 3851662721.

It is a cyclic number.

It is not a de Polignac number, because 1272661583 - 2⁶ = 1272661519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272661583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272661589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100628 + ... + 112566.

It is an arithmetic number, because the mean of its divisors is an integer number (84845640).

Almost surely, 2^1272661583 is an apocalyptic number.

1272661583 is a deficient number, since it is larger than the sum of its proper divisors (84868657).

1272661583 is a wasteful number, since it uses less digits than its factorization.

1272661583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12086.

The product of its digits is 120960, while the sum is 41.

The square root of 1272661583 is about 35674.3827276661. The cubic root of 1272661583 is about 1083.6881177597.

The spelling of 1272661583 in words is "one billion, two hundred seventy-two million, six hundred sixty-one thousand, five hundred eighty-three".