491729646031 has 4 divisors (see below), whose sum is σ = 529555003432. Its totient is φ = 453904288632.

The previous prime is 491729646029. The next prime is 491729646137. The reversal of 491729646031 is 130646927194.

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

It is a cyclic number.

It is not a de Polignac number, because 491729646031 - 2¹ = 491729646029 is a prime.

It is a super-2 number, since 2×491729646031² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491729646031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491729646431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18912678681 + ... + 18912678706.

It is an arithmetic number, because the mean of its divisors is an integer number (132388750858).

Almost surely, 2^491729646031 is an apocalyptic number.

491729646031 is a deficient number, since it is larger than the sum of its proper divisors (37825357401).

491729646031 is a wasteful number, since it uses less digits than its factorization.

491729646031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37825357400.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 491729646031 in words is "four hundred ninety-one billion, seven hundred twenty-nine million, six hundred forty-six thousand, thirty-one".