1971019902 has 16 divisors (see below), whose sum is σ = 3976926480. Its totient is φ = 651192192.

The previous prime is 1971019873. The next prime is 1971019907. The reversal of 1971019902 is 2099101791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971019907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452877 + ... + 1454232.

It is an arithmetic number, because the mean of its divisors is an integer number (248557905).

Almost surely, 2^1971019902 is an apocalyptic number.

1971019902 is an abundant number, since it is smaller than the sum of its proper divisors (2005906578).

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

1971019902 is a wasteful number, since it uses less digits than its factorization.

1971019902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907227.

The product of its (nonzero) digits is 10206, while the sum is 39.

The square root of 1971019902 is about 44396.1699023688. The cubic root of 1971019902 is about 1253.8059789513.

The spelling of 1971019902 in words is "one billion, nine hundred seventy-one million, nineteen thousand, nine hundred two".