145423551 has 16 divisors (see below), whose sum is σ = 238644224. Its totient is φ = 76706784.

The previous prime is 145423543. The next prime is 145423561. The reversal of 145423551 is 155324541.

It is not a de Polignac number, because 145423551 - 2³ = 145423543 is a prime.

It is a super-2 number, since 2×145423551² = 42296018370899202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145423501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266071 + ... + 266616.

It is an arithmetic number, because the mean of its divisors is an integer number (14915264).

Almost surely, 2^145423551 is an apocalyptic number.

145423551 is a deficient number, since it is larger than the sum of its proper divisors (93220673).

145423551 is a wasteful number, since it uses less digits than its factorization.

145423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532710.

The product of its digits is 12000, while the sum is 30.

The square root of 145423551 is about 12059.1687524472. The cubic root of 145423551 is about 525.8698215732.

The spelling of 145423551 in words is "one hundred forty-five million, four hundred twenty-three thousand, five hundred fifty-one".