145551613 has 4 divisors (see below), whose sum is σ = 151879968. Its totient is φ = 139223260.

The previous prime is 145551607. The next prime is 145551617. The reversal of 145551613 is 316155541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316155541 = 13 ⋅24319657.

It is a cyclic number.

It is not a de Polignac number, because 145551613 - 2²⁵ = 111997181 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145551617) 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, 3164143 + ... + 3164188.

It is an arithmetic number, because the mean of its divisors is an integer number (37969992).

Almost surely, 2^145551613 is an apocalyptic number.

It is an amenable number.

145551613 is a deficient number, since it is larger than the sum of its proper divisors (6328355).

145551613 is an equidigital number, since it uses as much as digits as its factorization.

145551613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6328354.

The product of its digits is 9000, while the sum is 31.

The square root of 145551613 is about 12064.4773198013. The cubic root of 145551613 is about 526.0241390417.

The spelling of 145551613 in words is "one hundred forty-five million, five hundred fifty-one thousand, six hundred thirteen".