491901432 has 32 divisors (see below), whose sum is σ = 1341550080. Its totient is φ = 149060960.

The previous prime is 491901379. The next prime is 491901439. The reversal of 491901432 is 234109194.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 491901393 and 491901402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491901439) 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, 931368 + ... + 931895.

It is an arithmetic number, because the mean of its divisors is an integer number (41923440).

Almost surely, 2^491901432 is an apocalyptic number.

It is an amenable number.

491901432 is an abundant number, since it is smaller than the sum of its proper divisors (849648648).

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

491901432 is a wasteful number, since it uses less digits than its factorization.

491901432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863283 (or 1863279 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 491901432 is about 22178.8510072095. The cubic root of 491901432 is about 789.3919542751.

The spelling of 491901432 in words is "four hundred ninety-one million, nine hundred one thousand, four hundred thirty-two".