155145727 has 4 divisors (see below), whose sum is σ = 169249896. Its totient is φ = 141041560.

The previous prime is 155145719. The next prime is 155145743. The reversal of 155145727 is 727541551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727541551 = 11 ⋅66140141.

It is not a de Polignac number, because 155145727 - 2³ = 155145719 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 (155142727) 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, 7052068 + ... + 7052089.

It is an arithmetic number, because the mean of its divisors is an integer number (42312474).

Almost surely, 2^155145727 is an apocalyptic number.

155145727 is a deficient number, since it is larger than the sum of its proper divisors (14104169).

155145727 is a wasteful number, since it uses less digits than its factorization.

155145727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14104168.

The product of its digits is 49000, while the sum is 37.

The square root of 155145727 is about 12455.7507601911. The cubic root of 155145727 is about 537.3368267627.

It can be divided in two parts, 1551 and 45727, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 155145727 in words is "one hundred fifty-five million, one hundred forty-five thousand, seven hundred twenty-seven".