145581421 has 32 divisors (see below), whose sum is σ = 171383040. Its totient is φ = 122766336.

The previous prime is 145581389. The next prime is 145581427. The reversal of 145581421 is 124185541.

It is a cyclic number.

It is not a de Polignac number, because 145581421 - 2⁵ = 145581389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145581427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419370 + ... + 419716.

It is an arithmetic number, because the mean of its divisors is an integer number (5355720).

Almost surely, 2^145581421 is an apocalyptic number.

It is an amenable number.

145581421 is a deficient number, since it is larger than the sum of its proper divisors (25801619).

145581421 is a wasteful number, since it uses less digits than its factorization.

145581421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453.

The product of its digits is 6400, while the sum is 31.

The square root of 145581421 is about 12065.7126188220. The cubic root of 145581421 is about 526.0600453363.

The spelling of 145581421 in words is "one hundred forty-five million, five hundred eighty-one thousand, four hundred twenty-one".