1261536463 has 8 divisors (see below), whose sum is σ = 1391685840. Its totient is φ = 1133964480.

The previous prime is 1261536457. The next prime is 1261536469. The reversal of 1261536463 is 3646351621.

It is an interprime number because it is at equal distance from previous prime (1261536457) and next prime (1261536469).

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

It is a de Polignac number, because none of the positive numbers 2^k-1261536463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261536469) 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, 643320 + ... + 645277.

It is an arithmetic number, because the mean of its divisors is an integer number (173960730).

Almost surely, 2^1261536463 is an apocalyptic number.

1261536463 is a deficient number, since it is larger than the sum of its proper divisors (130149377).

1261536463 is a wasteful number, since it uses less digits than its factorization.

1261536463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288697.

The product of its digits is 77760, while the sum is 37.

The square root of 1261536463 is about 35518.1145755233. The cubic root of 1261536463 is about 1080.5211428062.

The spelling of 1261536463 in words is "one billion, two hundred sixty-one million, five hundred thirty-six thousand, four hundred sixty-three".