145681431 has 16 divisors (see below), whose sum is σ = 229152768. Its totient is φ = 80560800.

The previous prime is 145681429. The next prime is 145681441. The reversal of 145681431 is 134186541.

It is not a de Polignac number, because 145681431 - 2¹ = 145681429 is a prime.

It is a super-2 number, since 2×145681431² = 42446158676415522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145681392 and 145681401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145681411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111240 + ... + 112541.

It is an arithmetic number, because the mean of its divisors is an integer number (14322048).

Almost surely, 2^145681431 is an apocalyptic number.

145681431 is a deficient number, since it is larger than the sum of its proper divisors (83471337).

145681431 is a wasteful number, since it uses less digits than its factorization.

145681431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223822.

The product of its digits is 11520, while the sum is 33.

The square root of 145681431 is about 12069.8562957477. The cubic root of 145681431 is about 526.1804801691.

The spelling of 145681431 in words is "one hundred forty-five million, six hundred eighty-one thousand, four hundred thirty-one".