1264061561 has 8 divisors (see below), whose sum is σ = 1458945984. Its totient is φ = 1072753200.

The previous prime is 1264061521. The next prime is 1264061563. The reversal of 1264061561 is 1651604621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264061561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264061563) 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, 893255 + ... + 894668.

It is an arithmetic number, because the mean of its divisors is an integer number (182368248).

Almost surely, 2^1264061561 is an apocalyptic number.

It is an amenable number.

1264061561 is a deficient number, since it is larger than the sum of its proper divisors (194884423).

1264061561 is a wasteful number, since it uses less digits than its factorization.

1264061561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788031.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1264061561 is about 35553.6434279245. The cubic root of 1264061561 is about 1081.2415879328.

The spelling of 1264061561 in words is "one billion, two hundred sixty-four million, sixty-one thousand, five hundred sixty-one".