641932947 has 6 divisors (see below), whose sum is σ = 927236492. Its totient is φ = 427955292.

The previous prime is 641932931. The next prime is 641932961. The reversal of 641932947 is 749239146.

It is a happy number.

It is not a de Polignac number, because 641932947 - 2⁴ = 641932931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641932147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35662933 + ... + 35662950.

Almost surely, 2^641932947 is an apocalyptic number.

641932947 is a deficient number, since it is larger than the sum of its proper divisors (285303545).

641932947 is a wasteful number, since it uses less digits than its factorization.

641932947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71325889 (or 71325886 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 641932947 is about 25336.3956986782. The cubic root of 641932947 is about 862.6405890548.

The spelling of 641932947 in words is "six hundred forty-one million, nine hundred thirty-two thousand, nine hundred forty-seven".