56351639 has 2 divisors, whose sum is σ = 56351640. Its totient is φ = 56351638.

The previous prime is 56351627. The next prime is 56351677. The reversal of 56351639 is 93615365.

It is an a-pointer prime, because the next prime (56351677) can be obtained adding 56351639 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56351639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56356639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28175819 + 28175820.

It is an arithmetic number, because the mean of its divisors is an integer number (28175820).

Almost surely, 2^56351639 is an apocalyptic number.

56351639 is a deficient number, since it is larger than the sum of its proper divisors (1).

56351639 is an equidigital number, since it uses as much as digits as its factorization.

56351639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 38.

The square root of 56351639 is about 7506.7728752108. The cubic root of 56351639 is about 383.3853534108.

The spelling of 56351639 in words is "fifty-six million, three hundred fifty-one thousand, six hundred thirty-nine".