145107731 has 4 divisors (see below), whose sum is σ = 152745000. Its totient is φ = 137470464.

The previous prime is 145107719. The next prime is 145107749. The reversal of 145107731 is 137701541.

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 145107731 - 2¹⁴ = 145091347 is a prime.

It is a super-2 number, since 2×145107731² = 42112507191936722, 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 = 145107694 and 145107703.

It is not an unprimeable number, because it can be changed into a prime (145107761) 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, 3818606 + ... + 3818643.

It is an arithmetic number, because the mean of its divisors is an integer number (38186250).

Almost surely, 2^145107731 is an apocalyptic number.

145107731 is a deficient number, since it is larger than the sum of its proper divisors (7637269).

145107731 is an equidigital number, since it uses as much as digits as its factorization.

145107731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7637268.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 145107731 is about 12046.0670345138. The cubic root of 145107731 is about 525.4888640689.

The spelling of 145107731 in words is "one hundred forty-five million, one hundred seven thousand, seven hundred thirty-one".