1201831997 has 8 divisors (see below), whose sum is σ = 1220450400. Its totient is φ = 1183233744.

The previous prime is 1201831991. The next prime is 1201831999. The reversal of 1201831997 is 7991381021.

It is a happy number.

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 1201831997 - 2²⁶ = 1134723133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201831991) 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 7 ways as a sum of consecutive naturals, for example, 152879 + ... + 160547.

It is an arithmetic number, because the mean of its divisors is an integer number (152556300).

Almost surely, 2^1201831997 is an apocalyptic number.

It is an amenable number.

1201831997 is a deficient number, since it is larger than the sum of its proper divisors (18618403).

1201831997 is an equidigital number, since it uses as much as digits as its factorization.

1201831997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10075.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1201831997 is about 34667.4486658594. The cubic root of 1201831997 is about 1063.1990684752.

The spelling of 1201831997 in words is "one billion, two hundred one million, eight hundred thirty-one thousand, nine hundred ninety-seven".