2129951 has 2 divisors, whose sum is σ = 2129952. Its totient is φ = 2129950.

The previous prime is 2129903. The next prime is 2129971. The reversal of 2129951 is 1599212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2129951 - 2⁶ = 2129887 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2129971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064975 + 1064976.

It is an arithmetic number, because the mean of its divisors is an integer number (1064976).

2^2129951 is an apocalyptic number.

2129951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2129951 is an equidigital number, since it uses as much as digits as its factorization.

2129951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 29.

The square root of 2129951 is about 1459.4351647127. The cubic root of 2129951 is about 128.6638484831.

The spelling of 2129951 in words is "two million, one hundred twenty-nine thousand, nine hundred fifty-one".