3551961 has 24 divisors (see below), whose sum is σ = 5601504. Its totient is φ = 1995840.

The previous prime is 3551957. The next prime is 3551981. The reversal of 3551961 is 1691553.

It is not a de Polignac number, because 3551961 - 2² = 3551957 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3551921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10566 + ... + 10896.

It is an arithmetic number, because the mean of its divisors is an integer number (233396).

Almost surely, 2^3551961 is an apocalyptic number.

It is an amenable number.

3551961 is a deficient number, since it is larger than the sum of its proper divisors (2049543).

3551961 is a wasteful number, since it uses less digits than its factorization.

3551961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 414 counting only the distinct ones).

The product of its digits is 4050, while the sum is 30.

The square root of 3551961 is about 1884.6646916627. The cubic root of 3551961 is about 152.5771140945.

The spelling of 3551961 in words is "three million, five hundred fifty-one thousand, nine hundred sixty-one".