1211609601 has 24 divisors (see below), whose sum is σ = 1855305504. Its totient is φ = 759300480.

The previous prime is 1211609593. The next prime is 1211609629. The reversal of 1211609601 is 1069061121.

It is not a de Polignac number, because 1211609601 - 2³ = 1211609593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211609671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134406 + ... + 143136.

It is an arithmetic number, because the mean of its divisors is an integer number (77304396).

Almost surely, 2^1211609601 is an apocalyptic number.

It is an amenable number.

1211609601 is a deficient number, since it is larger than the sum of its proper divisors (643695903).

1211609601 is a wasteful number, since it uses less digits than its factorization.

1211609601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9661 (or 9658 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1211609601 is about 34808.1829603328. The cubic root of 1211609601 is about 1066.0745327562.

The spelling of 1211609601 in words is "one billion, two hundred eleven million, six hundred nine thousand, six hundred one".