145691459 has 4 divisors (see below), whose sum is σ = 149629104. Its totient is φ = 141753816.

The previous prime is 145691443. The next prime is 145691461. The reversal of 145691459 is 954196541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 954196541 = 29 ⋅32903329.

It is a cyclic number.

It is not a de Polignac number, because 145691459 - 2⁴ = 145691443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145691059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968767 + ... + 1968840.

It is an arithmetic number, because the mean of its divisors is an integer number (37407276).

Almost surely, 2^145691459 is an apocalyptic number.

145691459 is a deficient number, since it is larger than the sum of its proper divisors (3937645).

145691459 is an equidigital number, since it uses as much as digits as its factorization.

145691459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937644.

The product of its digits is 194400, while the sum is 44.

The square root of 145691459 is about 12070.2717036527. The cubic root of 145691459 is about 526.1925531257.

The spelling of 145691459 in words is "one hundred forty-five million, six hundred ninety-one thousand, four hundred fifty-nine".