2135061491 has 2 divisors, whose sum is σ = 2135061492. Its totient is φ = 2135061490.

The previous prime is 2135061479. The next prime is 2135061529. The reversal of 2135061491 is 1941605312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2135061491 - 2¹⁸ = 2134799347 is a prime.

It is a super-2 number, since 2×2135061491² = 9116975140702286162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2135061421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067530745 + 1067530746.

It is an arithmetic number, because the mean of its divisors is an integer number (1067530746).

Almost surely, 2^2135061491 is an apocalyptic number.

2135061491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135061491 is an equidigital number, since it uses as much as digits as its factorization.

2135061491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 2135061491 is about 46206.7256035309. The cubic root of 2135061491 is about 1287.6666935458. Note that the first 4 decimals are identical.

The spelling of 2135061491 in words is "two billion, one hundred thirty-five million, sixty-one thousand, four hundred ninety-one".