1261500947 has 16 divisors (see below), whose sum is σ = 1452847104. Its totient is φ = 1072968000.

The previous prime is 1261500943. The next prime is 1261500959. The reversal of 1261500947 is 7490051621.

It is a cyclic number.

It is not a de Polignac number, because 1261500947 - 2² = 1261500943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261500943) 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, 695672 + ... + 697482.

It is an arithmetic number, because the mean of its divisors is an integer number (90802944).

Almost surely, 2^1261500947 is an apocalyptic number.

1261500947 is a deficient number, since it is larger than the sum of its proper divisors (191346157).

1261500947 is a wasteful number, since it uses less digits than its factorization.

1261500947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1261500947 is about 35517.6146017719. The cubic root of 1261500947 is about 1080.5110027507.

The spelling of 1261500947 in words is "one billion, two hundred sixty-one million, five hundred thousand, nine hundred forty-seven".