1208581961 has 8 divisors (see below), whose sum is σ = 1213461000. Its totient is φ = 1203713280.

The previous prime is 1208581937. The next prime is 1208581967. The reversal of 1208581961 is 1691858021.

It can be written as a sum of positive squares in 4 ways, for example, as 109327936 + 1099254025 = 10456^2 + 33155^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1208581961 - 2¹⁸ = 1208319817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1208581967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296465 + ... + 300513.

It is an arithmetic number, because the mean of its divisors is an integer number (151682625).

Almost surely, 2^1208581961 is an apocalyptic number.

It is an amenable number.

1208581961 is a deficient number, since it is larger than the sum of its proper divisors (4879039).

1208581961 is an equidigital number, since it uses as much as digits as its factorization.

1208581961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5179.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 1208581961 is about 34764.6654090040. The cubic root of 1208581961 is about 1065.1858025506.

The spelling of 1208581961 in words is "one billion, two hundred eight million, five hundred eighty-one thousand, nine hundred sixty-one".