33621901 has 2 divisors, whose sum is σ = 33621902. Its totient is φ = 33621900.

The previous prime is 33621881. The next prime is 33621911. The reversal of 33621901 is 10912633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 15217801 = 4290^2 + 3901^2 .

It is an emirp because it is prime and its reverse (10912633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33621901 - 2⁹ = 33621389 is a prime.

It is a super-2 number, since 2×33621901² = 2260864453707602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33621911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16810950 + 16810951.

It is an arithmetic number, because the mean of its divisors is an integer number (16810951).

Almost surely, 2^33621901 is an apocalyptic number.

It is an amenable number.

33621901 is a deficient number, since it is larger than the sum of its proper divisors (1).

33621901 is an equidigital number, since it uses as much as digits as its factorization.

33621901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 33621901 is about 5798.4395314602. The cubic root of 33621901 is about 322.7558244948.

The spelling of 33621901 in words is "thirty-three million, six hundred twenty-one thousand, nine hundred one".