641651397 has 8 divisors (see below), whose sum is σ = 861201600. Its totient is φ = 424934400.

The previous prime is 641651393. The next prime is 641651399. The reversal of 641651397 is 793156146.

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

It is not a de Polignac number, because 641651397 - 2² = 641651393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641651393) 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, 707772 + ... + 708677.

It is an arithmetic number, because the mean of its divisors is an integer number (107650200).

Almost surely, 2^641651397 is an apocalyptic number.

It is an amenable number.

641651397 is a deficient number, since it is larger than the sum of its proper divisors (219550203).

641651397 is a wasteful number, since it uses less digits than its factorization.

641651397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416603.

The product of its digits is 136080, while the sum is 42.

The square root of 641651397 is about 25330.8388530660. The cubic root of 641651397 is about 862.5144533600.

The spelling of 641651397 in words is "six hundred forty-one million, six hundred fifty-one thousand, three hundred ninety-seven".