1397065561 has 8 divisors (see below), whose sum is σ = 1442562048. Its totient is φ = 1351596000.

The previous prime is 1397065547. The next prime is 1397065577. The reversal of 1397065561 is 1655607931.

It is a happy number.

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 1397065561 - 2²¹ = 1394968409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397065511) 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, 198696 + ... + 205606.

It is an arithmetic number, because the mean of its divisors is an integer number (180320256).

Almost surely, 2^1397065561 is an apocalyptic number.

It is an amenable number.

1397065561 is a deficient number, since it is larger than the sum of its proper divisors (45496487).

1397065561 is an equidigital number, since it uses as much as digits as its factorization.

1397065561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13463.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 1397065561 is about 37377.3402076713. The cubic root of 1397065561 is about 1117.9067942967.

The spelling of 1397065561 in words is "one billion, three hundred ninety-seven million, sixty-five thousand, five hundred sixty-one".