3951561 has 8 divisors (see below), whose sum is σ = 5497920. Its totient is φ = 2519792.

The previous prime is 3951559. The next prime is 3951587. The reversal of 3951561 is 1651593.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3951561 - 2¹ = 3951559 is a prime.

It is a super-2 number, since 2×3951561² = 31229668673442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3951551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28566 + ... + 28703.

It is an arithmetic number, because the mean of its divisors is an integer number (687240).

Almost surely, 2^3951561 is an apocalyptic number.

It is an amenable number.

3951561 is a deficient number, since it is larger than the sum of its proper divisors (1546359).

3951561 is a wasteful number, since it uses less digits than its factorization.

3951561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57295.

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

The square root of 3951561 is about 1987.8533648134. The cubic root of 3951561 is about 158.0967334789.

Subtracting from 3951561 its reverse (1651593), we obtain a cube (2299968 = 132³).

The spelling of 3951561 in words is "three million, nine hundred fifty-one thousand, five hundred sixty-one".