145661251 has 2 divisors, whose sum is σ = 145661252. Its totient is φ = 145661250.

The previous prime is 145661249. The next prime is 145661279. The reversal of 145661251 is 152166541.

145661251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145661251 - 2¹ = 145661249 is a prime.

Together with 145661249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145661851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72830625 + 72830626.

It is an arithmetic number, because the mean of its divisors is an integer number (72830626).

Almost surely, 2^145661251 is an apocalyptic number.

145661251 is a deficient number, since it is larger than the sum of its proper divisors (1).

145661251 is an equidigital number, since it uses as much as digits as its factorization.

145661251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 145661251 is about 12069.0202999249. The cubic root of 145661251 is about 526.1561832898.

The spelling of 145661251 in words is "one hundred forty-five million, six hundred sixty-one thousand, two hundred fifty-one".