1246905661 has 8 divisors (see below), whose sum is σ = 1285598520. Its totient is φ = 1208475648.

The previous prime is 1246905659. The next prime is 1246905677. The reversal of 1246905661 is 1665096421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 996664900 + 250240761 = 31570^2 + 15819^2 .

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

It is not a de Polignac number, because 1246905661 - 2¹ = 1246905659 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 (1246903661) 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, 56056 + ... + 75073.

It is an arithmetic number, because the mean of its divisors is an integer number (160699815).

Almost surely, 2^1246905661 is an apocalyptic number.

It is an amenable number.

1246905661 is a deficient number, since it is larger than the sum of its proper divisors (38692859).

1246905661 is a wasteful number, since it uses less digits than its factorization.

1246905661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131423.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1246905661 is about 35311.5513819487. The cubic root of 1246905661 is about 1076.3277370407.

The spelling of 1246905661 in words is "one billion, two hundred forty-six million, nine hundred five thousand, six hundred sixty-one".