1208001961 has 4 divisors (see below), whose sum is σ = 1208157124. Its totient is φ = 1207846800.

The previous prime is 1208001953. The next prime is 1208002009. The reversal of 1208001961 is 1691008021.

It is a happy number.

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 859955625 + 348046336 = 29325^2 + 18656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1208001961 - 2³ = 1208001953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1208001941) 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, 65250 + ... + 81691.

It is an arithmetic number, because the mean of its divisors is an integer number (302039281).

Almost surely, 2^1208001961 is an apocalyptic number.

1208001961 is the 15544-th centered decagonal number.

It is an amenable number.

1208001961 is a deficient number, since it is larger than the sum of its proper divisors (155163).

1208001961 is an equidigital number, since it uses as much as digits as its factorization.

1208001961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155162.

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

The square root of 1208001961 is about 34756.3226046715. The cubic root of 1208001961 is about 1065.0153806179.

Adding to 1208001961 its reverse (1691008021), we get a palindrome (2899009982).

The spelling of 1208001961 in words is "one billion, two hundred eight million, one thousand, nine hundred sixty-one".