1261431458 has 16 divisors (see below), whose sum is σ = 2256474240. Its totient is φ = 517108416.

The previous prime is 1261431439. The next prime is 1261431499. The reversal of 1261431458 is 8541341621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1958423 + ... + 1959066.

It is an arithmetic number, because the mean of its divisors is an integer number (141029640).

Almost surely, 2^1261431458 is an apocalyptic number.

1261431458 is a deficient number, since it is larger than the sum of its proper divisors (995042782).

1261431458 is a wasteful number, since it uses less digits than its factorization.

1261431458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917521.

The product of its digits is 23040, while the sum is 35.

The square root of 1261431458 is about 35516.6363553758. The cubic root of 1261431458 is about 1080.4911626262.

The spelling of 1261431458 in words is "one billion, two hundred sixty-one million, four hundred thirty-one thousand, four hundred fifty-eight".