3521961 has 10 divisors (see below), whose sum is σ = 5261322. Its totient is φ = 2347920.

The previous prime is 3521953. The next prime is 3521977. The reversal of 3521961 is 1691253.

It can be written as a sum of positive squares in only one way, i.e., 3240000 + 281961 = 1800^2 + 531^2 .

It is not a de Polignac number, because 3521961 - 2³ = 3521953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3521951) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 21660 + ... + 21821.

Almost surely, 2^3521961 is an apocalyptic number.

It is an amenable number.

3521961 is a deficient number, since it is larger than the sum of its proper divisors (1739361).

3521961 is an equidigital number, since it uses as much as digits as its factorization.

3521961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43493 (or 43484 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 3521961 is about 1876.6888394190. The cubic root of 3521961 is about 152.1463416324.

The spelling of 3521961 in words is "three million, five hundred twenty-one thousand, nine hundred sixty-one".