145055391 has 16 divisors (see below), whose sum is σ = 209445600. Its totient is φ = 88767360.

The previous prime is 145055389. The next prime is 145055399. The reversal of 145055391 is 193550541.

It is not a de Polignac number, because 145055391 - 2¹ = 145055389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145055399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3216 + ... + 17333.

It is an arithmetic number, because the mean of its divisors is an integer number (13090350).

Almost surely, 2^145055391 is an apocalyptic number.

145055391 is a deficient number, since it is larger than the sum of its proper divisors (64390209).

145055391 is a wasteful number, since it uses less digits than its factorization.

145055391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20746.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 145055391 is about 12043.8943452689. The cubic root of 145055391 is about 525.4256756260.

The spelling of 145055391 in words is "one hundred forty-five million, fifty-five thousand, three hundred ninety-one".