1545639497 has 2 divisors, whose sum is σ = 1545639498. Its totient is φ = 1545639496.

The previous prime is 1545639481. The next prime is 1545639521. The reversal of 1545639497 is 7949365451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1397189641 + 148449856 = 37379^2 + 12184^2 .

It is an emirp because it is prime and its reverse (7949365451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1545639497 - 2⁴ = 1545639481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1545639427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772819748 + 772819749.

It is an arithmetic number, because the mean of its divisors is an integer number (772819749).

Almost surely, 2^1545639497 is an apocalyptic number.

It is an amenable number.

1545639497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545639497 is an equidigital number, since it uses as much as digits as its factorization.

1545639497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 53.

The square root of 1545639497 is about 39314.6219236558. The cubic root of 1545639497 is about 1156.2082636330.

The spelling of 1545639497 in words is "one billion, five hundred forty-five million, six hundred thirty-nine thousand, four hundred ninety-seven".