645141431 has 4 divisors (see below), whose sum is σ = 703790664. Its totient is φ = 586492200.

The previous prime is 645141407. The next prime is 645141451. The reversal of 645141431 is 134141546.

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 645141431 - 2¹⁰ = 645140407 is a prime.

It is a super-2 number, since 2×645141431² = 832414931985455522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645141394 and 645141403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645141401) 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, 29324600 + ... + 29324621.

It is an arithmetic number, because the mean of its divisors is an integer number (175947666).

Almost surely, 2^645141431 is an apocalyptic number.

645141431 is a deficient number, since it is larger than the sum of its proper divisors (58649233).

645141431 is a wasteful number, since it uses less digits than its factorization.

645141431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58649232.

The product of its digits is 5760, while the sum is 29.

The square root of 645141431 is about 25399.6344658737. The cubic root of 645141431 is about 864.0754066381.

Adding to 645141431 its reverse (134141546), we get a palindrome (779282977).

The spelling of 645141431 in words is "six hundred forty-five million, one hundred forty-one thousand, four hundred thirty-one".