1639474971 has 4 divisors (see below), whose sum is σ = 2185966632. Its totient is φ = 1092983312.

The previous prime is 1639474957. The next prime is 1639474973. The reversal of 1639474971 is 1794749361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1639474971 - 2⁷ = 1639474843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1639474973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273245826 + ... + 273245831.

It is an arithmetic number, because the mean of its divisors is an integer number (546491658).

Almost surely, 2^1639474971 is an apocalyptic number.

1639474971 is a deficient number, since it is larger than the sum of its proper divisors (546491661).

1639474971 is an equidigital number, since it uses as much as digits as its factorization.

1639474971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546491660.

The product of its digits is 1143072, while the sum is 51.

The square root of 1639474971 is about 40490.4306102071. The cubic root of 1639474971 is about 1179.1478504780.

The spelling of 1639474971 in words is "one billion, six hundred thirty-nine million, four hundred seventy-four thousand, nine hundred seventy-one".