1545656729 has 2 divisors, whose sum is σ = 1545656730. Its totient is φ = 1545656728.

The previous prime is 1545656719. The next prime is 1545656731. The reversal of 1545656729 is 9276565451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1373443600 + 172213129 = 37060^2 + 13123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545656729 - 2⁴ = 1545656713 is a prime.

Together with 1545656731, 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 (1545656719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772828364 + 772828365.

It is an arithmetic number, because the mean of its divisors is an integer number (772828365).

Almost surely, 2^1545656729 is an apocalyptic number.

It is an amenable number.

1545656729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545656729 is an equidigital number, since it uses as much as digits as its factorization.

1545656729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 50.

The square root of 1545656729 is about 39314.8410781476. The cubic root of 1545656729 is about 1156.2125603889.

The spelling of 1545656729 in words is "one billion, five hundred forty-five million, six hundred fifty-six thousand, seven hundred twenty-nine".