1261546651 has 8 divisors (see below), whose sum is σ = 1292460624. Its totient is φ = 1230896160.

The previous prime is 1261546639. The next prime is 1261546669. The reversal of 1261546651 is 1566451621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261546651 - 2¹⁷ = 1261415579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261546651.

It is not an unprimeable number, because it can be changed into a prime (1261546691) 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, 56161 + ... + 75346.

It is an arithmetic number, because the mean of its divisors is an integer number (161557578).

Almost surely, 2^1261546651 is an apocalyptic number.

1261546651 is a deficient number, since it is larger than the sum of its proper divisors (30913973).

1261546651 is a wasteful number, since it uses less digits than its factorization.

1261546651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131741.

The product of its digits is 43200, while the sum is 37.

The square root of 1261546651 is about 35518.2579950087. The cubic root of 1261546651 is about 1080.5240515132.

The spelling of 1261546651 in words is "one billion, two hundred sixty-one million, five hundred forty-six thousand, six hundred fifty-one".