645352971 has 8 divisors (see below), whose sum is σ = 870838080. Its totient is φ = 425051592.

The previous prime is 645352969. The next prime is 645352999. The reversal of 645352971 is 179253546.

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

It is not a de Polignac number, because 645352971 - 2¹ = 645352969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645352951) 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, 1295641 + ... + 1296138.

It is an arithmetic number, because the mean of its divisors is an integer number (108854760).

Almost surely, 2^645352971 is an apocalyptic number.

645352971 is a deficient number, since it is larger than the sum of its proper divisors (225485109).

645352971 is a wasteful number, since it uses less digits than its factorization.

645352971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591865.

The product of its digits is 226800, while the sum is 42.

The square root of 645352971 is about 25403.7983577260. The cubic root of 645352971 is about 864.1698389222.

The spelling of 645352971 in words is "six hundred forty-five million, three hundred fifty-two thousand, nine hundred seventy-one".