1971491830 has 32 divisors (see below), whose sum is σ = 4424336640. Its totient is φ = 614490720.

The previous prime is 1971491807. The next prime is 1971491839. The reversal of 1971491830 is 381941791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971491839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1279420 + ... + 1280959.

It is an arithmetic number, because the mean of its divisors is an integer number (138260520).

Almost surely, 2^1971491830 is an apocalyptic number.

1971491830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971491830 is an abundant number, since it is smaller than the sum of its proper divisors (2452844810).

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

1971491830 is a wasteful number, since it uses less digits than its factorization.

1971491830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560404.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1971491830 is about 44401.4845472536. The cubic root of 1971491830 is about 1253.9060386428.

The spelling of 1971491830 in words is "one billion, nine hundred seventy-one million, four hundred ninety-one thousand, eight hundred thirty".