145735681 has 32 divisors (see below), whose sum is σ = 194969600. Its totient is φ = 105675840.

The previous prime is 145735621. The next prime is 145735693. The reversal of 145735681 is 186537541.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 145735681 - 2⁷ = 145735553 is a prime.

It is a super-2 number, since 2×145735681² = 42477777433067522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145735621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52240 + ... + 54958.

It is an arithmetic number, because the mean of its divisors is an integer number (6092800).

It is a Proth number, since it is equal to 8895 ⋅ 2¹⁴ + 1 and 8895 < 2¹⁴.

Almost surely, 2^145735681 is an apocalyptic number.

It is an amenable number.

145735681 is a deficient number, since it is larger than the sum of its proper divisors (49233919).

145735681 is a wasteful number, since it uses less digits than its factorization.

145735681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789.

The product of its digits is 100800, while the sum is 40.

The square root of 145735681 is about 12072.1034206968. The cubic root of 145735681 is about 526.2457864754.

The spelling of 145735681 in words is "one hundred forty-five million, seven hundred thirty-five thousand, six hundred eighty-one".