2151281235823 has 2 divisors, whose sum is σ = 2151281235824. Its totient is φ = 2151281235822.

The previous prime is 2151281235809. The next prime is 2151281235899. The reversal of 2151281235823 is 3285321821512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151281235823 - 2³⁷ = 2013842282351 is a prime.

It is a super-3 number, since 3×2151281235823³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151281235823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151281232823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075640617911 + 1075640617912.

It is an arithmetic number, because the mean of its divisors is an integer number (1075640617912).

Almost surely, 2^{2151281235823} is an apocalyptic number.

2151281235823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151281235823 is an equidigital number, since it uses as much as digits as its factorization.

2151281235823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 43.

The spelling of 2151281235823 in words is "two trillion, one hundred fifty-one billion, two hundred eighty-one million, two hundred thirty-five thousand, eight hundred twenty-three".