1645120151 has 2 divisors, whose sum is σ = 1645120152. Its totient is φ = 1645120150.

The previous prime is 1645120133. The next prime is 1645120153. The reversal of 1645120151 is 1510215461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645120151 - 2²⁶ = 1578011287 is a prime.

It is a super-2 number, since 2×1645120151² = 5412840622452525602, which contains 22 as substring.

Together with 1645120153, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645120151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645120153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822560075 + 822560076.

It is an arithmetic number, because the mean of its divisors is an integer number (822560076).

Almost surely, 2^1645120151 is an apocalyptic number.

1645120151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645120151 is an equidigital number, since it uses as much as digits as its factorization.

1645120151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1645120151 is about 40560.0807568230. The cubic root of 1645120151 is about 1180.4996808878.

The spelling of 1645120151 in words is "one billion, six hundred forty-five million, one hundred twenty thousand, one hundred fifty-one".