2653991 has 2 divisors, whose sum is σ = 2653992. Its totient is φ = 2653990.

The previous prime is 2653979. The next prime is 2653999. The reversal of 2653991 is 1993562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2653991 - 2¹⁸ = 2391847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2653999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326995 + 1326996.

It is an arithmetic number, because the mean of its divisors is an integer number (1326996).

2^2653991 is an apocalyptic number.

2653991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2653991 is an equidigital number, since it uses as much as digits as its factorization.

2653991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 2653991 is about 1629.1074243278. The cubic root of 2653991 is about 138.4521854002.

The spelling of 2653991 in words is "two million, six hundred fifty-three thousand, nine hundred ninety-one".