645701429 has 6 divisors (see below), whose sum is σ = 685918434. Its totient is φ = 607718720.

The previous prime is 645701411. The next prime is 645701437. The reversal of 645701429 is 924107546.

It can be written as a sum of positive squares in 3 ways, for example, as 457874404 + 187827025 = 21398^2 + 13705^2 .

It is a de Polignac number, because none of the positive numbers 2^k-645701429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645701392 and 645701401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645701479) 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, 1116842 + ... + 1117419.

It is an arithmetic number, because the mean of its divisors is an integer number (114319739).

Almost surely, 2^645701429 is an apocalyptic number.

It is an amenable number.

645701429 is a deficient number, since it is larger than the sum of its proper divisors (40217005).

645701429 is a wasteful number, since it uses less digits than its factorization.

645701429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234295 (or 2234278 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 645701429 is about 25410.6558160155. The cubic root of 645701429 is about 864.3253469546.

The spelling of 645701429 in words is "six hundred forty-five million, seven hundred one thousand, four hundred twenty-nine".