1971812473 has 8 divisors (see below), whose sum is σ = 2144229192. Its totient is φ = 1805665536.

The previous prime is 1971812459. The next prime is 1971812483. The reversal of 1971812473 is 3742181791.

It can be written as a sum of positive squares in 4 ways, for example, as 1595762809 + 376049664 = 39947^2 + 19392^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1971812473 - 2¹⁷ = 1971681401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971812483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1566790 + ... + 1568047.

It is an arithmetic number, because the mean of its divisors is an integer number (268028649).

Almost surely, 2^1971812473 is an apocalyptic number.

It is an amenable number.

1971812473 is a deficient number, since it is larger than the sum of its proper divisors (172416719).

1971812473 is a wasteful number, since it uses less digits than its factorization.

1971812473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134891.

The product of its digits is 84672, while the sum is 43.

The square root of 1971812473 is about 44405.0951243210. The cubic root of 1971812473 is about 1253.9740132924.

The spelling of 1971812473 in words is "one billion, nine hundred seventy-one million, eight hundred twelve thousand, four hundred seventy-three".