201989131 has 2 divisors, whose sum is σ = 201989132. Its totient is φ = 201989130.

The previous prime is 201989119. The next prime is 201989153. The reversal of 201989131 is 131989102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201989131 - 2⁷ = 201989003 is a prime.

It is a super-2 number, since 2×201989131² = 81599218084270322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201989191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100994565 + 100994566.

It is an arithmetic number, because the mean of its divisors is an integer number (100994566).

Almost surely, 2^201989131 is an apocalyptic number.

201989131 is a deficient number, since it is larger than the sum of its proper divisors (1).

201989131 is an equidigital number, since it uses as much as digits as its factorization.

201989131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 201989131 is about 14212.2880283225. The cubic root of 201989131 is about 586.7359069807.

The spelling of 201989131 in words is "two hundred one million, nine hundred eighty-nine thousand, one hundred thirty-one".