145781247 has 8 divisors (see below), whose sum is σ = 197112960. Its totient is φ = 95818520.

The previous prime is 145781191. The next prime is 145781249. The reversal of 145781247 is 742187541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145781247 - 2⁶ = 145781183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145781249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341997 + ... + 342422.

It is an arithmetic number, because the mean of its divisors is an integer number (24639120).

Almost surely, 2^145781247 is an apocalyptic number.

145781247 is a deficient number, since it is larger than the sum of its proper divisors (51331713).

145781247 is an equidigital number, since it uses as much as digits as its factorization.

145781247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684493.

The product of its digits is 62720, while the sum is 39.

The square root of 145781247 is about 12073.9905168093. The cubic root of 145781247 is about 526.3006264356.

The spelling of 145781247 in words is "one hundred forty-five million, seven hundred eighty-one thousand, two hundred forty-seven".