1298396661 has 8 divisors (see below), whose sum is σ = 1733027424. Its totient is φ = 864681840.

The previous prime is 1298396629. The next prime is 1298396669. The reversal of 1298396661 is 1666938921.

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

It is not a de Polignac number, because 1298396661 - 2⁵ = 1298396629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298396669) 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, 225670 + ... + 231351.

It is an arithmetic number, because the mean of its divisors is an integer number (216628428).

Almost surely, 2^1298396661 is an apocalyptic number.

It is an amenable number.

1298396661 is a deficient number, since it is larger than the sum of its proper divisors (434630763).

1298396661 is an equidigital number, since it uses as much as digits as its factorization.

1298396661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457971.

The product of its digits is 839808, while the sum is 51.

The square root of 1298396661 is about 36033.2715833575. The cubic root of 1298396661 is about 1090.9440131478.

The spelling of 1298396661 in words is "one billion, two hundred ninety-eight million, three hundred ninety-six thousand, six hundred sixty-one".