491025386 has 4 divisors (see below), whose sum is σ = 736538082. Its totient is φ = 245512692.

The previous prime is 491025383. The next prime is 491025401. The reversal of 491025386 is 683520194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 331786225 + 159239161 = 18215^2 + 12619^2 .

It is a super-2 number, since 2×491025386² = 482211859392897992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491025383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122756345 + ... + 122756348.

Almost surely, 2^491025386 is an apocalyptic number.

491025386 is a deficient number, since it is larger than the sum of its proper divisors (245512696).

491025386 is a wasteful number, since it uses less digits than its factorization.

491025386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245512695.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 491025386 is about 22159.0926258274. The cubic root of 491025386 is about 788.9230564040.

The spelling of 491025386 in words is "four hundred ninety-one million, twenty-five thousand, three hundred eighty-six".