64431401 has 2 divisors, whose sum is σ = 64431402. Its totient is φ = 64431400.

The previous prime is 64431383. The next prime is 64431427. The reversal of 64431401 is 10413446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33640000 + 30791401 = 5800^2 + 5549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64431401 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (64431431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32215700 + 32215701.

It is an arithmetic number, because the mean of its divisors is an integer number (32215701).

Almost surely, 2^64431401 is an apocalyptic number.

It is an amenable number.

64431401 is a deficient number, since it is larger than the sum of its proper divisors (1).

64431401 is an equidigital number, since it uses as much as digits as its factorization.

64431401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 64431401 is about 8026.9172787565. The cubic root of 64431401 is about 400.8967402235.

Adding to 64431401 its reverse (10413446), we get a palindrome (74844847).

The spelling of 64431401 in words is "sixty-four million, four hundred thirty-one thousand, four hundred one".