1212801913 has 4 divisors (see below), whose sum is σ = 1284143220. Its totient is φ = 1141460608.

The previous prime is 1212801899. The next prime is 1212801943. The reversal of 1212801913 is 3191082121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1089858169 + 122943744 = 33013^2 + 11088^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212801913 - 2¹³ = 1212793721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212801943) 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, 35670628 + ... + 35670661.

It is an arithmetic number, because the mean of its divisors is an integer number (321035805).

Almost surely, 2^1212801913 is an apocalyptic number.

It is an amenable number.

1212801913 is a deficient number, since it is larger than the sum of its proper divisors (71341307).

1212801913 is an equidigital number, since it uses as much as digits as its factorization.

1212801913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71341306.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1212801913 is about 34825.3056411570. The cubic root of 1212801913 is about 1066.4241164108.

The spelling of 1212801913 in words is "one billion, two hundred twelve million, eight hundred one thousand, nine hundred thirteen".