2151336491 has 2 divisors, whose sum is σ = 2151336492. Its totient is φ = 2151336490.

The previous prime is 2151336479. The next prime is 2151336559. The reversal of 2151336491 is 1946331512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151336491 - 2²⁶ = 2084227627 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151336401) 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, 1075668245 + 1075668246.

It is an arithmetic number, because the mean of its divisors is an integer number (1075668246).

Almost surely, 2^2151336491 is an apocalyptic number.

2151336491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151336491 is an equidigital number, since it uses as much as digits as its factorization.

2151336491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 2151336491 is about 46382.5019915916. The cubic root of 2151336491 is about 1290.9302608325.

The spelling of 2151336491 in words is "two billion, one hundred fifty-one million, three hundred thirty-six thousand, four hundred ninety-one".