145955551 has 4 divisors (see below), whose sum is σ = 166806352. Its totient is φ = 125104752.

The previous prime is 145955519. The next prime is 145955561. The reversal of 145955551 is 155559541.

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 145955551 - 2⁵ = 145955519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145955501) 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, 10425390 + ... + 10425403.

It is an arithmetic number, because the mean of its divisors is an integer number (41701588).

Almost surely, 2^145955551 is an apocalyptic number.

145955551 is a deficient number, since it is larger than the sum of its proper divisors (20850801).

145955551 is an equidigital number, since it uses as much as digits as its factorization.

145955551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20850800.

The product of its digits is 112500, while the sum is 40.

The square root of 145955551 is about 12081.2065208736. The cubic root of 145955551 is about 526.5103007911.

The spelling of 145955551 in words is "one hundred forty-five million, nine hundred fifty-five thousand, five hundred fifty-one".