145251553 has 8 divisors (see below), whose sum is σ = 156318120. Its totient is φ = 134465280.

The previous prime is 145251539. The next prime is 145251629. The reversal of 145251553 is 355152541.

It can be written as a sum of positive squares in 4 ways, for example, as 19430464 + 125821089 = 4408^2 + 11217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145251553 - 2⁵ = 145251521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145251503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68998 + ... + 71071.

It is an arithmetic number, because the mean of its divisors is an integer number (19539765).

Almost surely, 2^145251553 is an apocalyptic number.

It is an amenable number.

145251553 is a deficient number, since it is larger than the sum of its proper divisors (11066567).

145251553 is a wasteful number, since it uses less digits than its factorization.

145251553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140147.

The product of its digits is 15000, while the sum is 31.

The square root of 145251553 is about 12052.0352223183. The cubic root of 145251553 is about 525.6624176614.

The spelling of 145251553 in words is "one hundred forty-five million, two hundred fifty-one thousand, five hundred fifty-three".