64431361 has 4 divisors (see below), whose sum is σ = 66509824. Its totient is φ = 62352900.

The previous prime is 64431281. The next prime is 64431371. The reversal of 64431361 is 16313446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16313446 = 2 ⋅8156723.

It is a cyclic number.

It is not a de Polignac number, because 64431361 - 2¹³ = 64423169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64431371) 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, 1039185 + ... + 1039246.

It is an arithmetic number, because the mean of its divisors is an integer number (16627456).

Almost surely, 2^64431361 is an apocalyptic number.

It is an amenable number.

64431361 is a deficient number, since it is larger than the sum of its proper divisors (2078463).

64431361 is a wasteful number, since it uses less digits than its factorization.

64431361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078462.

The product of its digits is 5184, while the sum is 28.

The square root of 64431361 is about 8026.9147871396. The cubic root of 64431361 is about 400.8966572625.

The spelling of 64431361 in words is "sixty-four million, four hundred thirty-one thousand, three hundred sixty-one".