3501645421 has 4 divisors (see below), whose sum is σ = 3502026144. Its totient is φ = 3501264700.

The previous prime is 3501645401. The next prime is 3501645439. The reversal of 3501645421 is 1245461053.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1245461053 = 31 ⋅40176163.

It is a cyclic number.

It is not a de Polignac number, because 3501645421 - 2²⁹ = 2964774509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3501645401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176215 + ... + 195076.

It is an arithmetic number, because the mean of its divisors is an integer number (875506536).

Almost surely, 2^3501645421 is an apocalyptic number.

It is an amenable number.

3501645421 is a deficient number, since it is larger than the sum of its proper divisors (380723).

3501645421 is an equidigital number, since it uses as much as digits as its factorization.

3501645421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380722.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 3501645421 is about 59174.7025425561. The cubic root of 3501645421 is about 1518.5323756753.

The spelling of 3501645421 in words is "three billion, five hundred one million, six hundred forty-five thousand, four hundred twenty-one".