145331551 has 4 divisors (see below), whose sum is σ = 152980600. Its totient is φ = 137682504.

The previous prime is 145331507. The next prime is 145331569. The reversal of 145331551 is 155133541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145331551 - 2²⁵ = 111777119 is a prime.

It is a super-2 number, since 2×145331551² = 42242519432131202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145331051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3824496 + ... + 3824533.

It is an arithmetic number, because the mean of its divisors is an integer number (38245150).

Almost surely, 2^145331551 is an apocalyptic number.

145331551 is a deficient number, since it is larger than the sum of its proper divisors (7649049).

145331551 is an equidigital number, since it uses as much as digits as its factorization.

145331551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649048.

The product of its digits is 4500, while the sum is 28.

The square root of 145331551 is about 12055.3536240129. The cubic root of 145331551 is about 525.7589036622.

The spelling of 145331551 in words is "one hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-one".