687379501 has 2 divisors, whose sum is σ = 687379502. Its totient is φ = 687379500.

The previous prime is 687379493. The next prime is 687379519. The reversal of 687379501 is 105973786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437897476 + 249482025 = 20926^2 + 15795^2 .

It is a cyclic number.

It is not a de Polignac number, because 687379501 - 2³ = 687379493 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 (687379571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343689750 + 343689751.

It is an arithmetic number, because the mean of its divisors is an integer number (343689751).

Almost surely, 2^687379501 is an apocalyptic number.

It is an amenable number.

687379501 is a deficient number, since it is larger than the sum of its proper divisors (1).

687379501 is an equidigital number, since it uses as much as digits as its factorization.

687379501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 687379501 is about 26217.9232777884. The cubic root of 687379501 is about 882.5355167648.

The spelling of 687379501 in words is "six hundred eighty-seven million, three hundred seventy-nine thousand, five hundred one".