145917049 has 4 divisors (see below), whose sum is σ = 146110564. Its totient is φ = 145723536.

The previous prime is 145917043. The next prime is 145917053. The reversal of 145917049 is 940719541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129049600 + 16867449 = 11360^2 + 4107^2 .

It is a cyclic number.

It is not a de Polignac number, because 145917049 - 2⁷ = 145916921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145917043) 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, 95622 + ... + 97135.

It is an arithmetic number, because the mean of its divisors is an integer number (36527641).

Almost surely, 2^145917049 is an apocalyptic number.

It is an amenable number.

145917049 is a deficient number, since it is larger than the sum of its proper divisors (193515).

145917049 is an equidigital number, since it uses as much as digits as its factorization.

145917049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193514.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 145917049 is about 12079.6129490973. The cubic root of 145917049 is about 526.4640002057.

The spelling of 145917049 in words is "one hundred forty-five million, nine hundred seventeen thousand, forty-nine".