1201217641 has 8 divisors (see below), whose sum is σ = 1295869064. Its totient is φ = 1106887680.

The previous prime is 1201217629. The next prime is 1201217657. The reversal of 1201217641 is 1467121021.

It can be written as a sum of positive squares in 4 ways, for example, as 335622400 + 865595241 = 18320^2 + 29421^2 .

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 1201217641 - 2⁵ = 1201217609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201217141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72570 + ... + 87571.

It is an arithmetic number, because the mean of its divisors is an integer number (161983633).

Almost surely, 2^1201217641 is an apocalyptic number.

It is an amenable number.

1201217641 is a deficient number, since it is larger than the sum of its proper divisors (94651423).

1201217641 is a wasteful number, since it uses less digits than its factorization.

1201217641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160731.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1201217641 is about 34658.5868292405. The cubic root of 1201217641 is about 1063.0178745261.

Adding to 1201217641 its reverse (1467121021), we get a palindrome (2668338662).

The spelling of 1201217641 in words is "one billion, two hundred one million, two hundred seventeen thousand, six hundred forty-one".