145621201 has 12 divisors (see below), whose sum is σ = 169480836. Its totient is φ = 124593920.

The previous prime is 145621183. The next prime is 145621237. The reversal of 145621201 is 102126541.

It can be written as a sum of positive squares in 2 ways, for example, as 49561600 + 96059601 = 7040^2 + 9801^2 .

It is not a de Polignac number, because 145621201 - 2⁵ = 145621169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145621001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33340 + ... + 37453.

It is an arithmetic number, because the mean of its divisors is an integer number (14123403).

Almost surely, 2^145621201 is an apocalyptic number.

145621201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145621201 is a deficient number, since it is larger than the sum of its proper divisors (23859635).

145621201 is a wasteful number, since it uses less digits than its factorization.

145621201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70832 (or 70821 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 145621201 is about 12067.3609791039. The cubic root of 145621201 is about 526.1079561267.

Adding to 145621201 its reverse (102126541), we get a palindrome (247747742).

The spelling of 145621201 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred one".