145257261 has 16 divisors (see below), whose sum is σ = 204272640. Its totient is φ = 91560240.

The previous prime is 145257257. The next prime is 145257263. The reversal of 145257261 is 162752541.

It is not a de Polignac number, because 145257261 - 2² = 145257257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145257263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30316 + ... + 34778.

It is an arithmetic number, because the mean of its divisors is an integer number (12767040).

Almost surely, 2^145257261 is an apocalyptic number.

It is an amenable number.

145257261 is a deficient number, since it is larger than the sum of its proper divisors (59015379).

145257261 is a wasteful number, since it uses less digits than its factorization.

145257261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056.

The product of its digits is 16800, while the sum is 33.

The square root of 145257261 is about 12052.2720264687. The cubic root of 145257261 is about 525.6693032832.

The spelling of 145257261 in words is "one hundred forty-five million, two hundred fifty-seven thousand, two hundred sixty-one".