145421551 has 12 divisors (see below), whose sum is σ = 160790616. Its totient is φ = 131418320.

The previous prime is 145421543. The next prime is 145421567. The reversal of 145421551 is 155124541.

It is not a de Polignac number, because 145421551 - 2³ = 145421543 is a prime.

It is a super-2 number, since 2×145421551² = 42294854990491202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145421501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17460 + ... + 24406.

It is an arithmetic number, because the mean of its divisors is an integer number (13399218).

Almost surely, 2^145421551 is an apocalyptic number.

145421551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145421551 is a deficient number, since it is larger than the sum of its proper divisors (15369065).

145421551 is a wasteful number, since it uses less digits than its factorization.

145421551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142 (or 7131 counting only the distinct ones).

The product of its digits is 4000, while the sum is 28.

The square root of 145421551 is about 12059.0858277068. The cubic root of 145421551 is about 525.8674108118.

It can be divided in two parts, 1454 and 21551, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 145421551 in words is "one hundred forty-five million, four hundred twenty-one thousand, five hundred fifty-one".