145243731 has 8 divisors (see below), whose sum is σ = 193777600. Its totient is φ = 96769512.

The previous prime is 145243727. The next prime is 145243753. The reversal of 145243731 is 137342541.

It is a happy number.

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

It is not a de Polignac number, because 145243731 - 2² = 145243727 is a prime.

It is a super-2 number, since 2×145243731² = 42191482789600722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145243331) 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 7 ways as a sum of consecutive naturals, for example, 8881 + ... + 19218.

It is an arithmetic number, because the mean of its divisors is an integer number (24222200).

Almost surely, 2^145243731 is an apocalyptic number.

145243731 is a deficient number, since it is larger than the sum of its proper divisors (48533869).

145243731 is a wasteful number, since it uses less digits than its factorization.

145243731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29825.

The product of its digits is 10080, while the sum is 30.

The square root of 145243731 is about 12051.7107084430. The cubic root of 145243731 is about 525.6529816057.

The spelling of 145243731 in words is "one hundred forty-five million, two hundred forty-three thousand, seven hundred thirty-one".