1545772423 has 4 divisors (see below), whose sum is σ = 1664678008. Its totient is φ = 1426866840.

The previous prime is 1545772411. The next prime is 1545772427. The reversal of 1545772423 is 3242775451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3242775451 = 23 ⋅140990237.

It is a cyclic number.

It is not a de Polignac number, because 1545772423 - 2¹⁷ = 1545641351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1545772427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59452773 + ... + 59452798.

It is an arithmetic number, because the mean of its divisors is an integer number (416169502).

Almost surely, 2^1545772423 is an apocalyptic number.

1545772423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1545772423 is a deficient number, since it is larger than the sum of its proper divisors (118905585).

1545772423 is a wasteful number, since it uses less digits than its factorization.

1545772423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118905584.

The product of its digits is 235200, while the sum is 40.

The square root of 1545772423 is about 39316.3124288125. The cubic root of 1545772423 is about 1156.2414075699.

The spelling of 1545772423 in words is "one billion, five hundred forty-five million, seven hundred seventy-two thousand, four hundred twenty-three".