145779881 has 4 divisors (see below), whose sum is σ = 156993732. Its totient is φ = 134566032.

The previous prime is 145779877. The next prime is 145779899. The reversal of 145779881 is 188977541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188977541 = 7481 ⋅25261.

It can be written as a sum of positive squares in 2 ways, for example, as 53523856 + 92256025 = 7316^2 + 9605^2 .

It is a cyclic number.

It is not a de Polignac number, because 145779881 - 2² = 145779877 is a prime.

It is a super-2 number, since 2×145779881² = 42503547408748322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145779181) 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, 5606906 + ... + 5606931.

It is an arithmetic number, because the mean of its divisors is an integer number (39248433).

Almost surely, 2^145779881 is an apocalyptic number.

It is an amenable number.

145779881 is a deficient number, since it is larger than the sum of its proper divisors (11213851).

145779881 is a wasteful number, since it uses less digits than its factorization.

145779881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213850.

The product of its digits is 564480, while the sum is 50.

The square root of 145779881 is about 12073.9339488006. The cubic root of 145779881 is about 526.2989825824.

The spelling of 145779881 in words is "one hundred forty-five million, seven hundred seventy-nine thousand, eight hundred eighty-one".