3435631621 has 4 divisors (see below), whose sum is σ = 3436947052. Its totient is φ = 3434316192.

The previous prime is 3435631579. The next prime is 3435631627. The reversal of 3435631621 is 1261365343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1261365343 = 7 ⋅180195049.

It can be written as a sum of positive squares in 2 ways, for example, as 3348936900 + 86694721 = 57870^2 + 9311^2 .

It is a cyclic number.

It is not a de Polignac number, because 3435631621 - 2⁹ = 3435631109 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 (3435631627) 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, 653790 + ... + 659023.

It is an arithmetic number, because the mean of its divisors is an integer number (859236763).

Almost surely, 2^3435631621 is an apocalyptic number.

It is an amenable number.

3435631621 is a deficient number, since it is larger than the sum of its proper divisors (1315431).

3435631621 is a wasteful number, since it uses less digits than its factorization.

3435631621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315430.

The product of its digits is 38880, while the sum is 34.

The square root of 3435631621 is about 58614.2612424656. The cubic root of 3435631621 is about 1508.9292031202.

Adding to 3435631621 its reverse (1261365343), we get a palindrome (4696996964).

The spelling of 3435631621 in words is "three billion, four hundred thirty-five million, six hundred thirty-one thousand, six hundred twenty-one".