701645621 has 4 divisors (see below), whose sum is σ = 702647244. Its totient is φ = 700644000.

The previous prime is 701645603. The next prime is 701645627. The reversal of 701645621 is 126546107.

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

It can be written as a sum of positive squares in 2 ways, for example, as 565012900 + 136632721 = 23770^2 + 11689^2 .

It is a cyclic number.

It is not a de Polignac number, because 701645621 - 2⁶ = 701645557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (701645627) 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, 499760 + ... + 501161.

It is an arithmetic number, because the mean of its divisors is an integer number (175661811).

Almost surely, 2^701645621 is an apocalyptic number.

It is an amenable number.

701645621 is a deficient number, since it is larger than the sum of its proper divisors (1001623).

701645621 is a wasteful number, since it uses less digits than its factorization.

701645621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001622.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 701645621 is about 26488.5941680566. The cubic root of 701645621 is about 888.5992445817.

The spelling of 701645621 in words is "seven hundred one million, six hundred forty-five thousand, six hundred twenty-one".