491211651213 has 40 divisors (see below), whose sum is σ = 746903282400. Its totient is φ = 321630266592.

The previous prime is 491211651209. The next prime is 491211651253. The reversal of 491211651213 is 312156112194.

491211651213 is a `hidden beast` number, since 4 + 9 + 12 + 116 + 512 + 13 = 666.

It is not a de Polignac number, because 491211651213 - 2² = 491211651209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491211651253) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5253570 + ... + 5346252.

It is an arithmetic number, because the mean of its divisors is an integer number (18672582060).

Almost surely, 2^491211651213 is an apocalyptic number.

It is an amenable number.

491211651213 is a deficient number, since it is larger than the sum of its proper divisors (255691631187).

491211651213 is a wasteful number, since it uses less digits than its factorization.

491211651213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93863 (or 93854 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The spelling of 491211651213 in words is "four hundred ninety-one billion, two hundred eleven million, six hundred fifty-one thousand, two hundred thirteen".