1297161216 has 264 divisors, whose sum is σ = 4193467824. Its totient is φ = 398131200.

The previous prime is 1297161211. The next prime is 1297161221. The reversal of 1297161216 is 6121617921.

1297161216 is a `hidden beast` number, since 1 + 29 + 7 + 1 + 612 + 16 = 666.

It is an interprime number because it is at equal distance from previous prime (1297161211) and next prime (1297161221).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297161211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3234616 + ... + 3235016.

Almost surely, 2^1297161216 is an apocalyptic number.

1297161216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297161216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2096733912).

1297161216 is an abundant number, since it is smaller than the sum of its proper divisors (2896306608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1297161216 is an equidigital number, since it uses as much as digits as its factorization.

1297161216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 419 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 1297161216 is about 36016.1243889456. The cubic root of 1297161216 is about 1090.5978865037.

The spelling of 1297161216 in words is "one billion, two hundred ninety-seven million, one hundred sixty-one thousand, two hundred sixteen".