145621226 has 4 divisors (see below), whose sum is σ = 218431842. Its totient is φ = 72810612.

The previous prime is 145621183. The next prime is 145621237. The reversal of 145621226 is 622126541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622126541 = 283 ⋅2198327.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 27573001 = 10865^2 + 5251^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36405305 + ... + 36405308.

Almost surely, 2^145621226 is an apocalyptic number.

145621226 is a deficient number, since it is larger than the sum of its proper divisors (72810616).

145621226 is an equidigital number, since it uses as much as digits as its factorization.

145621226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72810615.

The product of its digits is 5760, while the sum is 29.

The square root of 145621226 is about 12067.3620149559. The cubic root of 145621226 is about 526.1079862338.

Adding to 145621226 its reverse (622126541), we get a palindrome (767747767).

The spelling of 145621226 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred twenty-six".