1201606621 has 8 divisors (see below), whose sum is σ = 1205493440. Its totient is φ = 1197726912.

The previous prime is 1201606519. The next prime is 1201606633. The reversal of 1201606621 is 1266061021.

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 1201606621 - 2¹³ = 1201598429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201603621) 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, 777976 + ... + 779518.

It is an arithmetic number, because the mean of its divisors is an integer number (150686680).

Almost surely, 2^1201606621 is an apocalyptic number.

It is an amenable number.

1201606621 is a deficient number, since it is larger than the sum of its proper divisors (3886819).

1201606621 is a wasteful number, since it uses less digits than its factorization.

1201606621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1201606621 is about 34664.1979713941. The cubic root of 1201606621 is about 1063.1326047948.

Adding to 1201606621 its reverse (1266061021), we get a palindrome (2467667642).

The spelling of 1201606621 in words is "one billion, two hundred one million, six hundred six thousand, six hundred twenty-one".