145098561 has 4 divisors (see below), whose sum is σ = 193464752. Its totient is φ = 96732372.

The previous prime is 145098557. The next prime is 145098599. The reversal of 145098561 is 165890541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165890541 = 3 ⋅55296847.

It is not a de Polignac number, because 145098561 - 2² = 145098557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145098521) 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, 24183091 + ... + 24183096.

It is an arithmetic number, because the mean of its divisors is an integer number (48366188).

Almost surely, 2^145098561 is an apocalyptic number.

It is an amenable number.

145098561 is a deficient number, since it is larger than the sum of its proper divisors (48366191).

145098561 is an equidigital number, since it uses as much as digits as its factorization.

145098561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48366190.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 145098561 is about 12045.6864063448. The cubic root of 145098561 is about 525.4777945130.

The spelling of 145098561 in words is "one hundred forty-five million, ninety-eight thousand, five hundred sixty-one".