145621237 has 2 divisors, whose sum is σ = 145621238. Its totient is φ = 145621236.

The previous prime is 145621183. The next prime is 145621249. The reversal of 145621237 is 732126541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135629316 + 9991921 = 11646^2 + 3161^2 .

It is an emirp because it is prime and its reverse (732126541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145621237 - 2⁷ = 145621109 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145621199 and 145621208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145621277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810618 + 72810619.

It is an arithmetic number, because the mean of its divisors is an integer number (72810619).

Almost surely, 2^145621237 is an apocalyptic number.

It is an amenable number.

145621237 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621237 is an equidigital number, since it uses as much as digits as its factorization.

145621237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 145621237 is about 12067.3624707307. The cubic root of 145621237 is about 526.1079994809.

Adding to 145621237 its reverse (732126541), we get a palindrome (877747778).

The spelling of 145621237 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred thirty-seven".