145912921 has 48 divisors (see below), whose sum is σ = 198051840. Its totient is φ = 104382720.

The previous prime is 145912901. The next prime is 145912927. The reversal of 145912921 is 129219541.

It is not a de Polignac number, because 145912921 - 2²⁵ = 112358489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145912927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1757946 + ... + 1758028.

It is an arithmetic number, because the mean of its divisors is an integer number (4126080).

Almost surely, 2^145912921 is an apocalyptic number.

145912921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145912921 is a deficient number, since it is larger than the sum of its proper divisors (52138919).

145912921 is a wasteful number, since it uses less digits than its factorization.

145912921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 197 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 145912921 is about 12079.4420814870. The cubic root of 145912921 is about 526.4590355953.

The spelling of 145912921 in words is "one hundred forty-five million, nine hundred twelve thousand, nine hundred twenty-one".