1261449567 has 12 divisors (see below), whose sum is σ = 2082393040. Its totient is φ = 720828288.

The previous prime is 1261449503. The next prime is 1261449571. The reversal of 1261449567 is 7659441621.

It is not a de Polignac number, because 1261449567 - 2⁶ = 1261449503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261449587) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10011442 + ... + 10011567.

Almost surely, 2^1261449567 is an apocalyptic number.

1261449567 is a deficient number, since it is larger than the sum of its proper divisors (820943473).

1261449567 is a wasteful number, since it uses less digits than its factorization.

1261449567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20023022 (or 20023019 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1261449567 is about 35516.8912913278. The cubic root of 1261449567 is about 1080.4963330804.

The spelling of 1261449567 in words is "one billion, two hundred sixty-one million, four hundred forty-nine thousand, five hundred sixty-seven".