201391432 has 24 divisors (see below), whose sum is σ = 415059750. Its totient is φ = 91541120.

The previous prime is 201391387. The next prime is 201391433. The reversal of 201391432 is 234193102.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 86601636 = 10714^2 + 9306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201391397 and 201391406.

It is not an unprimeable number, because it can be changed into a prime (201391433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103057 + ... + 104992.

Almost surely, 2^201391432 is an apocalyptic number.

201391432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201391432 is an abundant number, since it is smaller than the sum of its proper divisors (213668318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201391432 is a wasteful number, since it uses less digits than its factorization.

201391432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208077 (or 208062 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 201391432 is about 14191.2449066317. The cubic root of 201391432 is about 586.1566052806.

The spelling of 201391432 in words is "two hundred one million, three hundred ninety-one thousand, four hundred thirty-two".