491553442 has 4 divisors (see below), whose sum is σ = 737330166. Its totient is φ = 245776720.

The previous prime is 491553431. The next prime is 491553443. The reversal of 491553442 is 244355194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244355194 = 2 ⋅122177597.

It can be written as a sum of positive squares in only one way, i.e., 431351361 + 60202081 = 20769^2 + 7759^2 .

It is not an unprimeable number, because it can be changed into a prime (491553443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122888359 + ... + 122888362.

Almost surely, 2^491553442 is an apocalyptic number.

491553442 is a deficient number, since it is larger than the sum of its proper divisors (245776724).

491553442 is a wasteful number, since it uses less digits than its factorization.

491553442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245776723.

The product of its digits is 86400, while the sum is 37.

The square root of 491553442 is about 22171.0045329480. The cubic root of 491553442 is about 789.2057616143.

The spelling of 491553442 in words is "four hundred ninety-one million, five hundred fifty-three thousand, four hundred forty-two".