646953401 has 4 divisors (see below), whose sum is σ = 681003600. Its totient is φ = 612903204.

The previous prime is 646953397. The next prime is 646953409. The reversal of 646953401 is 104359646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646953401 - 2² = 646953397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646953409) 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, 17025071 + ... + 17025108.

It is an arithmetic number, because the mean of its divisors is an integer number (170250900).

Almost surely, 2^646953401 is an apocalyptic number.

It is an amenable number.

646953401 is a deficient number, since it is larger than the sum of its proper divisors (34050199).

646953401 is a wasteful number, since it uses less digits than its factorization.

646953401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34050198.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 646953401 is about 25435.2786695959. The cubic root of 646953401 is about 864.8836093634.

The spelling of 646953401 in words is "six hundred forty-six million, nine hundred fifty-three thousand, four hundred one".