145681929 has 16 divisors (see below), whose sum is σ = 216384640. Its totient is φ = 96869520.

The previous prime is 145681889. The next prime is 145681933. The reversal of 145681929 is 929186541.

145681929 is a `hidden beast` number, since 1 + 456 + 8 + 192 + 9 = 666.

145681929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145681929 - 2¹⁷ = 145550857 is a prime.

It is a super-2 number, since 2×145681929² = 42446448874322082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145681429) 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, 3924 + ... + 17514.

It is an arithmetic number, because the mean of its divisors is an integer number (13524040).

Almost surely, 2^145681929 is an apocalyptic number.

It is an amenable number.

145681929 is a deficient number, since it is larger than the sum of its proper divisors (70702711).

145681929 is a wasteful number, since it uses less digits than its factorization.

145681929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13997 (or 13991 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 145681929 is about 12069.8769256360. The cubic root of 145681929 is about 526.1810797366.

The spelling of 145681929 in words is "one hundred forty-five million, six hundred eighty-one thousand, nine hundred twenty-nine".