145751881 has 6 divisors (see below), whose sum is σ = 160206746. Its totient is φ = 132501600.

The previous prime is 145751849. The next prime is 145751887. The reversal of 145751881 is 188157541.

It can be written as a sum of positive squares in only one way, i.e., 102191881 + 43560000 = 10109^2 + 6600^2 .

It is not a de Polignac number, because 145751881 - 2⁵ = 145751849 is a prime.

It is a super-2 number, since 2×145751881² = 42487221630076322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145751887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602160 + ... + 602401.

Almost surely, 2^145751881 is an apocalyptic number.

145751881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145751881 is a deficient number, since it is larger than the sum of its proper divisors (14454865).

145751881 is a wasteful number, since it uses less digits than its factorization.

145751881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204583 (or 1204572 counting only the distinct ones).

The product of its digits is 44800, while the sum is 40.

The square root of 145751881 is about 12072.7743704585. The cubic root of 145751881 is about 526.2652849396.

The spelling of 145751881 in words is "one hundred forty-five million, seven hundred fifty-one thousand, eight hundred eighty-one".