145451431 has 4 divisors (see below), whose sum is σ = 145559664. Its totient is φ = 145343200.

The previous prime is 145451399. The next prime is 145451437. The reversal of 145451431 is 134154541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145451431 - 2⁵ = 145451399 is a prime.

It is a super-2 number, since 2×145451431² = 42312237559895522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145451431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145451437) 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, 52075 + ... + 54796.

It is an arithmetic number, because the mean of its divisors is an integer number (36389916).

Almost surely, 2^145451431 is an apocalyptic number.

145451431 is a deficient number, since it is larger than the sum of its proper divisors (108233).

145451431 is a wasteful number, since it uses less digits than its factorization.

145451431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108232.

The product of its digits is 4800, while the sum is 28.

The square root of 145451431 is about 12060.3246639549. The cubic root of 145451431 is about 525.9034252861.

The spelling of 145451431 in words is "one hundred forty-five million, four hundred fifty-one thousand, four hundred thirty-one".