3951121 has 2 divisors, whose sum is σ = 3951122. Its totient is φ = 3951120.

The previous prime is 3951113. The next prime is 3951127. The reversal of 3951121 is 1211593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3027600 + 923521 = 1740^2 + 961^2 .

It is an emirp because it is prime and its reverse (1211593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3951121 - 2³ = 3951113 is a prime.

It is a super-2 number, since 2×3951121² = 31222714313282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3951092 and 3951101.

It is not a weakly prime, because it can be changed into another prime (3951127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975560 + 1975561.

It is an arithmetic number, because the mean of its divisors is an integer number (1975561).

Almost surely, 2^3951121 is an apocalyptic number.

It is an amenable number.

3951121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3951121 is an equidigital number, since it uses as much as digits as its factorization.

3951121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 3951121 is about 1987.7426895853. The cubic root of 3951121 is about 158.0908653216.

The spelling of 3951121 in words is "three million, nine hundred fifty-one thousand, one hundred twenty-one".