145644831731 has 8 divisors (see below), whose sum is σ = 176242485600. Its totient is φ = 117494990208.

The previous prime is 145644831727. The next prime is 145644831769. The reversal of 145644831731 is 137138446541.

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 145644831731 - 2² = 145644831727 is a prime.

It is a super-2 number, since 2×145644831731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145644837731) 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, 611952956 + ... + 611953193.

It is an arithmetic number, because the mean of its divisors is an integer number (22030310700).

Almost surely, 2^145644831731 is an apocalyptic number.

145644831731 is a deficient number, since it is larger than the sum of its proper divisors (30597653869).

145644831731 is a wasteful number, since it uses less digits than its factorization.

145644831731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223906173.

The product of its digits is 967680, while the sum is 47.

The spelling of 145644831731 in words is "one hundred forty-five billion, six hundred forty-four million, eight hundred thirty-one thousand, seven hundred thirty-one".