145493131 has 4 divisors (see below), whose sum is σ = 166277872. Its totient is φ = 124708392.

The previous prime is 145493119. The next prime is 145493149. The reversal of 145493131 is 131394541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131394541 = 43 ⋅3055687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145493131 is a prime.

It is a super-2 number, since 2×145493131² = 42336502336366322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145493093 and 145493102.

It is not an unprimeable number, because it can be changed into a prime (145491131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10392360 + ... + 10392373.

It is an arithmetic number, because the mean of its divisors is an integer number (41569468).

Almost surely, 2^145493131 is an apocalyptic number.

145493131 is a deficient number, since it is larger than the sum of its proper divisors (20784741).

145493131 is an equidigital number, since it uses as much as digits as its factorization.

145493131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20784740.

The product of its digits is 6480, while the sum is 31.

The square root of 145493131 is about 12062.0533492437. The cubic root of 145493131 is about 525.9536782062.

The spelling of 145493131 in words is "one hundred forty-five million, four hundred ninety-three thousand, one hundred thirty-one".