201257831 has 4 divisors (see below), whose sum is σ = 203332752. Its totient is φ = 199182912.

The previous prime is 201257821. The next prime is 201257839. The reversal of 201257831 is 138752102.

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 201257831 - 2¹⁰ = 201256807 is a prime.

It is a super-2 number, since 2×201257831² = 81009429077649122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201257794 and 201257803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201257839) 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, 1037315 + ... + 1037508.

It is an arithmetic number, because the mean of its divisors is an integer number (50833188).

Almost surely, 2^201257831 is an apocalyptic number.

201257831 is a deficient number, since it is larger than the sum of its proper divisors (2074921).

201257831 is an equidigital number, since it uses as much as digits as its factorization.

201257831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074920.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 201257831 is about 14186.5369629096. The cubic root of 201257831 is about 586.0269598580.

The spelling of 201257831 in words is "two hundred one million, two hundred fifty-seven thousand, eight hundred thirty-one".