145752781 has 16 divisors (see below), whose sum is σ = 165922560. Its totient is φ = 127180800.

The previous prime is 145752779. The next prime is 145752791. The reversal of 145752781 is 187257541.

It is a cyclic number.

It is not a de Polignac number, because 145752781 - 2¹ = 145752779 is a prime.

It is a super-2 number, since 2×145752781² = 42487746338467922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145752701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10381 + ... + 19981.

It is an arithmetic number, because the mean of its divisors is an integer number (10370160).

Almost surely, 2^145752781 is an apocalyptic number.

It is an amenable number.

145752781 is a deficient number, since it is larger than the sum of its proper divisors (20169779).

145752781 is a wasteful number, since it uses less digits than its factorization.

145752781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9684.

The product of its digits is 78400, while the sum is 40.

The square root of 145752781 is about 12072.8116443519. The cubic root of 145752781 is about 526.2663681452.

The spelling of 145752781 in words is "one hundred forty-five million, seven hundred fifty-two thousand, seven hundred eighty-one".