2145255491 has 2 divisors, whose sum is σ = 2145255492. Its totient is φ = 2145255490.

The previous prime is 2145255457. The next prime is 2145255493. The reversal of 2145255491 is 1945525412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2145255491 - 2²⁶ = 2078146627 is a prime.

It is a super-2 number, since 2×2145255491² = 9204242243331302162, which contains 22 as substring.

Together with 2145255493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2145255493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072627745 + 1072627746.

It is an arithmetic number, because the mean of its divisors is an integer number (1072627746).

Almost surely, 2^2145255491 is an apocalyptic number.

2145255491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145255491 is an equidigital number, since it uses as much as digits as its factorization.

2145255491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 38.

The square root of 2145255491 is about 46316.9028649369. The cubic root of 2145255491 is about 1289.7127920585.

The spelling of 2145255491 in words is "two billion, one hundred forty-five million, two hundred fifty-five thousand, four hundred ninety-one".