1200097649 has 4 divisors (see below), whose sum is σ = 1203883764. Its totient is φ = 1196311536.

The previous prime is 1200097597. The next prime is 1200097687. The reversal of 1200097649 is 9467900021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9467900021 = 23 ⋅411647827.

It can be written as a sum of positive squares in 2 ways, for example, as 412902400 + 787195249 = 20320^2 + 28057^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200097649 - 2¹² = 1200093553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200093649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1892582 + ... + 1893215.

It is an arithmetic number, because the mean of its divisors is an integer number (300970941).

Almost surely, 2^1200097649 is an apocalyptic number.

It is an amenable number.

1200097649 is a deficient number, since it is larger than the sum of its proper divisors (3786115).

1200097649 is an equidigital number, since it uses as much as digits as its factorization.

1200097649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786114.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1200097649 is about 34642.4255646166. The cubic root of 1200097649 is about 1062.6873927193.

The spelling of 1200097649 in words is "one billion, two hundred million, ninety-seven thousand, six hundred forty-nine".