145684901 has 4 divisors (see below), whose sum is σ = 147321900. Its totient is φ = 144047904.

The previous prime is 145684879. The next prime is 145684907. The reversal of 145684901 is 109486541.

It is a Cunningham number, because it is equal to 12070²+1.

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 27984100 + 117700801 = 5290^2 + 10849^2 .

It is a cyclic number.

It is not a de Polignac number, because 145684901 - 2¹⁴ = 145668517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145684907) 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, 818366 + ... + 818543.

It is an arithmetic number, because the mean of its divisors is an integer number (36830475).

Almost surely, 2^145684901 is an apocalyptic number.

It is an amenable number.

145684901 is a deficient number, since it is larger than the sum of its proper divisors (1636999).

145684901 is an equidigital number, since it uses as much as digits as its factorization.

145684901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636998.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 145684901 is about 12070.0000414250. Note that the first 4 decimals coincide. The cubic root of 145684901 is about 526.1846578504.

The spelling of 145684901 in words is "one hundred forty-five million, six hundred eighty-four thousand, nine hundred one".