145646551 has 4 divisors (see below), whose sum is σ = 145714752. Its totient is φ = 145578352.

The previous prime is 145646549. The next prime is 145646593. The reversal of 145646551 is 155646541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155646541 = 43 ⋅3619687.

It is a cyclic number.

It is not a de Polignac number, because 145646551 - 2¹ = 145646549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145646551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145646351) 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, 30790 + ... + 35203.

It is an arithmetic number, because the mean of its divisors is an integer number (36428688).

Almost surely, 2^145646551 is an apocalyptic number.

145646551 is a deficient number, since it is larger than the sum of its proper divisors (68201).

145646551 is an equidigital number, since it uses as much as digits as its factorization.

145646551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68200.

The product of its digits is 72000, while the sum is 37.

The square root of 145646551 is about 12068.4112873236. The cubic root of 145646551 is about 526.1384829611.

It can be divided in two parts, 14564 and 6551, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 145646551 in words is "one hundred forty-five million, six hundred forty-six thousand, five hundred fifty-one".