1545549961 has 2 divisors, whose sum is σ = 1545549962. Its totient is φ = 1545549960.

The previous prime is 1545549959. The next prime is 1545550001. The reversal of 1545549961 is 1699455451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367594361 + 177955600 = 36981^2 + 13340^2 .

It is an emirp because it is prime and its reverse (1699455451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1545549961 - 2¹ = 1545549959 is a prime.

Together with 1545549959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1545549911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772774980 + 772774981.

It is an arithmetic number, because the mean of its divisors is an integer number (772774981).

Almost surely, 2^1545549961 is an apocalyptic number.

It is an amenable number.

1545549961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545549961 is an equidigital number, since it uses as much as digits as its factorization.

1545549961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 49.

The square root of 1545549961 is about 39313.4831959723. The cubic root of 1545549961 is about 1156.1859375425.

The spelling of 1545549961 in words is "one billion, five hundred forty-five million, five hundred forty-nine thousand, nine hundred sixty-one".