1971478655 has 8 divisors (see below), whose sum is σ = 2399095584. Its totient is φ = 1554968800.

The previous prime is 1971478637. The next prime is 1971478657. The reversal of 1971478655 is 5568741791.

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

It is not a de Polignac number, because 1971478655 - 2¹⁴ = 1971462271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1971478597 and 1971478606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971478657) 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, 2776376 + ... + 2777085.

It is an arithmetic number, because the mean of its divisors is an integer number (299886948).

Almost surely, 2^1971478655 is an apocalyptic number.

1971478655 is a deficient number, since it is larger than the sum of its proper divisors (427616929).

1971478655 is an equidigital number, since it uses as much as digits as its factorization.

1971478655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553537.

The product of its digits is 2116800, while the sum is 53.

The square root of 1971478655 is about 44401.3361848492. The cubic root of 1971478655 is about 1253.9032454536.

The spelling of 1971478655 in words is "one billion, nine hundred seventy-one million, four hundred seventy-eight thousand, six hundred fifty-five".