145531407 has 16 divisors (see below), whose sum is σ = 234807552. Its totient is φ = 78268800.

The previous prime is 145531387. The next prime is 145531409. The reversal of 145531407 is 704135541.

It is not a de Polignac number, because 145531407 - 2⁶ = 145531343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145531409) 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, 203469 + ... + 204182.

It is an arithmetic number, because the mean of its divisors is an integer number (14675472).

Almost surely, 2^145531407 is an apocalyptic number.

145531407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

145531407 is a deficient number, since it is larger than the sum of its proper divisors (89276145).

145531407 is a wasteful number, since it uses less digits than its factorization.

145531407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407678.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 145531407 is about 12063.6398736037. The cubic root of 145531407 is about 525.9997963923. Note that the first 3 decimals are identical.

Adding to 145531407 its reverse (704135541), we get a palindrome (849666948).

The spelling of 145531407 in words is "one hundred forty-five million, five hundred thirty-one thousand, four hundred seven".