1047663961 has 4 divisors (see below), whose sum is σ = 1093214592. Its totient is φ = 1002113332.

The previous prime is 1047663949. The next prime is 1047663977. The reversal of 1047663961 is 1693667401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1693667401 = 41 ⋅41308961.

It is a cyclic number.

It is not a de Polignac number, because 1047663961 - 2⁷ = 1047663833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1047663361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22775281 + ... + 22775326.

It is an arithmetic number, because the mean of its divisors is an integer number (273303648).

Almost surely, 2^1047663961 is an apocalyptic number.

It is an amenable number.

1047663961 is a deficient number, since it is larger than the sum of its proper divisors (45550631).

1047663961 is an equidigital number, since it uses as much as digits as its factorization.

1047663961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45550630.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1047663961 is about 32367.6375566707. The cubic root of 1047663961 is about 1015.6420379198.

The spelling of 1047663961 in words is "one billion, forty-seven million, six hundred sixty-three thousand, nine hundred sixty-one".