145388731 has 2 divisors, whose sum is σ = 145388732. Its totient is φ = 145388730.

The previous prime is 145388717. The next prime is 145388821. The reversal of 145388731 is 137883541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145388731 - 2⁷ = 145388603 is a prime.

It is a super-2 number, since 2×145388731² = 42275766203580722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145388231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72694365 + 72694366.

It is an arithmetic number, because the mean of its divisors is an integer number (72694366).

Almost surely, 2^145388731 is an apocalyptic number.

145388731 is a deficient number, since it is larger than the sum of its proper divisors (1).

145388731 is an equidigital number, since it uses as much as digits as its factorization.

145388731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 145388731 is about 12057.7249512501. The cubic root of 145388731 is about 525.8278470588.

The spelling of 145388731 in words is "one hundred forty-five million, three hundred eighty-eight thousand, seven hundred thirty-one".