201231491 has 8 divisors (see below), whose sum is σ = 204721344. Its totient is φ = 197771200.

The previous prime is 201231479. The next prime is 201231517. The reversal of 201231491 is 194132102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201231491 - 2⁶ = 201231427 is a prime.

It is a super-2 number, since 2×201231491² = 80988225940166162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201231391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6566 + ... + 21108.

It is an arithmetic number, because the mean of its divisors is an integer number (25590168).

Almost surely, 2^201231491 is an apocalyptic number.

201231491 is a deficient number, since it is larger than the sum of its proper divisors (3489853).

201231491 is a wasteful number, since it uses less digits than its factorization.

201231491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14781.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 201231491 is about 14185.6085875792. The cubic root of 201231491 is about 586.0013929463.

Adding to 201231491 its reverse (194132102), we get a palindrome (395363593).

The spelling of 201231491 in words is "two hundred one million, two hundred thirty-one thousand, four hundred ninety-one".