145981669 has 8 divisors (see below), whose sum is σ = 154683648. Its totient is φ = 137292480.

The previous prime is 145981637. The next prime is 145981673. The reversal of 145981669 is 966189541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145981669 - 2⁵ = 145981637 is a prime.

It is a super-2 number, since 2×145981669² = 42621295368051122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145981699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30604 + ... + 35050.

It is an arithmetic number, because the mean of its divisors is an integer number (19335456).

Almost surely, 2^145981669 is an apocalyptic number.

It is an amenable number.

145981669 is a deficient number, since it is larger than the sum of its proper divisors (8701979).

145981669 is a wasteful number, since it uses less digits than its factorization.

145981669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395.

The product of its digits is 466560, while the sum is 49.

The square root of 145981669 is about 12082.2874076062. The cubic root of 145981669 is about 526.5417043606.

The spelling of 145981669 in words is "one hundred forty-five million, nine hundred eighty-one thousand, six hundred sixty-nine".