145291421 has 16 divisors (see below), whose sum is σ = 164453760. Its totient is φ = 127149120.

The previous prime is 145291409. The next prime is 145291439. The reversal of 145291421 is 124192541.

145291421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 145291421 - 2⁶ = 145291357 is a prime.

It is a super-2 number, since 2×145291421² = 42219194032398482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145291481) 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, 195176 + ... + 195918.

It is an arithmetic number, because the mean of its divisors is an integer number (10278360).

Almost surely, 2^145291421 is an apocalyptic number.

145291421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145291421 is a deficient number, since it is larger than the sum of its proper divisors (19162339).

145291421 is a wasteful number, since it uses less digits than its factorization.

145291421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396.

The product of its digits is 2880, while the sum is 29.

The square root of 145291421 is about 12053.6891033409. The cubic root of 145291421 is about 525.7105070891.

The spelling of 145291421 in words is "one hundred forty-five million, two hundred ninety-one thousand, four hundred twenty-one".