3951261 has 10 divisors (see below), whose sum is σ = 5902622. Its totient is φ = 2634120.

The previous prime is 3951253. The next prime is 3951263. The reversal of 3951261 is 1621593.

It can be written as a sum of positive squares in only one way, i.e., 2340900 + 1610361 = 1530^2 + 1269^2 .

It is not a de Polignac number, because 3951261 - 2³ = 3951253 is a prime.

It is a super-2 number, since 2×3951261² = 31224926980242, which contains 22 as substring.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3951263) 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, 24310 + ... + 24471.

Almost surely, 2^3951261 is an apocalyptic number.

It is an amenable number.

3951261 is a deficient number, since it is larger than the sum of its proper divisors (1951361).

3951261 is an equidigital number, since it uses as much as digits as its factorization.

3951261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48793 (or 48784 counting only the distinct ones).

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

The square root of 3951261 is about 1987.7779050991. Note that the first 3 decimals coincide. The cubic root of 3951261 is about 158.0927325098.

The spelling of 3951261 in words is "three million, nine hundred fifty-one thousand, two hundred sixty-one".