1200891213 has 6 divisors (see below), whose sum is σ = 1734620654. Its totient is φ = 800594136.

The previous prime is 1200891193. The next prime is 1200891221. The reversal of 1200891213 is 3121980021.

It can be written as a sum of positive squares in only one way, i.e., 891201609 + 309689604 = 29853^2 + 17598^2 .

It is not a de Polignac number, because 1200891213 - 2¹⁸ = 1200629069 is a prime.

It is a super-2 number, since 2×1200891213² = 2884279410921222738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200891413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66716170 + ... + 66716187.

Almost surely, 2^1200891213 is an apocalyptic number.

It is an amenable number.

1200891213 is a deficient number, since it is larger than the sum of its proper divisors (533729441).

1200891213 is a wasteful number, since it uses less digits than its factorization.

1200891213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133432363 (or 133432360 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1200891213 is about 34653.8773155328. The cubic root of 1200891213 is about 1062.9215749537.

The spelling of 1200891213 in words is "one billion, two hundred million, eight hundred ninety-one thousand, two hundred thirteen".