201998031 has 4 divisors (see below), whose sum is σ = 269330712. Its totient is φ = 134665352.

The previous prime is 201998011. The next prime is 201998089. The reversal of 201998031 is 130899102.

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

It is a cyclic number.

It is not a de Polignac number, because 201998031 - 2¹³ = 201989839 is a prime.

It is a super-2 number, since 2×201998031² = 81606409055753922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201997983 and 201998001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201998011) 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, 33666336 + ... + 33666341.

It is an arithmetic number, because the mean of its divisors is an integer number (67332678).

Almost surely, 2^201998031 is an apocalyptic number.

201998031 is a deficient number, since it is larger than the sum of its proper divisors (67332681).

201998031 is an equidigital number, since it uses as much as digits as its factorization.

201998031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67332680.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 201998031 is about 14212.6011342048. The cubic root of 201998031 is about 586.7445243963.

The spelling of 201998031 in words is "two hundred one million, nine hundred ninety-eight thousand, thirty-one".