201957139 has 4 divisors (see below), whose sum is σ = 201993120. Its totient is φ = 201921160.

The previous prime is 201957113. The next prime is 201957143. The reversal of 201957139 is 931759102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931759102 = 2 ⋅465879551.

It is a cyclic number.

It is not a de Polignac number, because 201957139 - 2²¹ = 199859987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201957098 and 201957107.

It is not an unprimeable number, because it can be changed into a prime (201957149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7552 + ... + 21469.

It is an arithmetic number, because the mean of its divisors is an integer number (50498280).

Almost surely, 2^201957139 is an apocalyptic number.

201957139 is a deficient number, since it is larger than the sum of its proper divisors (35981).

201957139 is an equidigital number, since it uses as much as digits as its factorization.

201957139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35980.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 201957139 is about 14211.1624788404. The cubic root of 201957139 is about 586.7049286699.

The spelling of 201957139 in words is "two hundred one million, nine hundred fifty-seven thousand, one hundred thirty-nine".