4020691 has 2 divisors, whose sum is σ = 4020692. Its totient is φ = 4020690.

The previous prime is 4020671. The next prime is 4020701. The reversal of 4020691 is 1960204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4020691 - 2⁷ = 4020563 is a prime.

It is a super-2 number, since 2×4020691² = 32331912234962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4020631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010345 + 2010346.

It is an arithmetic number, because the mean of its divisors is an integer number (2010346).

Almost surely, 2^4020691 is an apocalyptic number.

4020691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020691 is an equidigital number, since it uses as much as digits as its factorization.

4020691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 4020691 is about 2005.1660779098. The cubic root of 4020691 is about 159.0133422344.

Adding to 4020691 its reverse (1960204), we get a palindrome (5980895).

The spelling of 4020691 in words is "four million, twenty thousand, six hundred ninety-one".