145017931 has 4 divisors (see below), whose sum is σ = 147004552. Its totient is φ = 143031312.

The previous prime is 145017913. The next prime is 145017941. The reversal of 145017931 is 139710541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145017931 - 2¹¹ = 145015883 is a prime.

It is a super-2 number, since 2×145017931² = 42060400623041522, 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 = 145017893 and 145017902.

It is not an unprimeable number, because it can be changed into a prime (145017941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993201 + ... + 993346.

It is an arithmetic number, because the mean of its divisors is an integer number (36751138).

Almost surely, 2^145017931 is an apocalyptic number.

145017931 is a deficient number, since it is larger than the sum of its proper divisors (1986621).

145017931 is an equidigital number, since it uses as much as digits as its factorization.

145017931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986620.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 145017931 is about 12042.3391000254. The cubic root of 145017931 is about 525.3804420082.

The spelling of 145017931 in words is "one hundred forty-five million, seventeen thousand, nine hundred thirty-one".