1971161938290 has 16 divisors (see below), whose sum is σ = 4730788651968. Its totient is φ = 525643183536.

The previous prime is 1971161938261. The next prime is 1971161938303. The reversal of 1971161938290 is 928391611791.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1971161938290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32852698942 + ... + 32852699001.

It is an arithmetic number, because the mean of its divisors is an integer number (295674290748).

Almost surely, 2^{1971161938290} is an apocalyptic number.

1971161938290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971161938290 is an abundant number, since it is smaller than the sum of its proper divisors (2759626713678).

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

1971161938290 is a wasteful number, since it uses less digits than its factorization.

1971161938290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65705397953.

The product of its (nonzero) digits is 1469664, while the sum is 57.

The spelling of 1971161938290 in words is "one trillion, nine hundred seventy-one billion, one hundred sixty-one million, nine hundred thirty-eight thousand, two hundred ninety".