16201901 has 4 divisors (see below), whose sum is σ = 17154972. Its totient is φ = 15248832.

The previous prime is 16201897. The next prime is 16201903. The reversal of 16201901 is 10910261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11383876 + 4818025 = 3374^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 16201901 - 2² = 16201897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16201903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476510 + ... + 476543.

It is an arithmetic number, because the mean of its divisors is an integer number (4288743).

Almost surely, 2^16201901 is an apocalyptic number.

It is an amenable number.

16201901 is a deficient number, since it is larger than the sum of its proper divisors (953071).

16201901 is an equidigital number, since it uses as much as digits as its factorization.

16201901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953070.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 16201901 is about 4025.1585061957. The cubic root of 16201901 is about 253.0396965213.

The spelling of 16201901 in words is "sixteen million, two hundred one thousand, nine hundred one".