145919551 has 4 divisors (see below), whose sum is σ = 154503072. Its totient is φ = 137336032.

The previous prime is 145919539. The next prime is 145919581. The reversal of 145919551 is 155919541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155919541 = 10739 ⋅14519.

It is a cyclic number.

It is not a de Polignac number, because 145919551 - 2¹⁷ = 145788479 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145919581) 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, 4291735 + ... + 4291768.

It is an arithmetic number, because the mean of its divisors is an integer number (38625768).

Almost surely, 2^145919551 is an apocalyptic number.

145919551 is a deficient number, since it is larger than the sum of its proper divisors (8583521).

145919551 is an equidigital number, since it uses as much as digits as its factorization.

145919551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8583520.

The product of its digits is 40500, while the sum is 40.

The square root of 145919551 is about 12079.7165115743. The cubic root of 145919551 is about 526.4670092335.

It can be divided in two parts, 14591 and 9551, that added together give a palindrome (24142).

The spelling of 145919551 in words is "one hundred forty-five million, nine hundred nineteen thousand, five hundred fifty-one".