51699587 has 2 divisors, whose sum is σ = 51699588. Its totient is φ = 51699586.

The previous prime is 51699581. The next prime is 51699611. The reversal of 51699587 is 78599615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51699587 - 2⁶ = 51699523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51699581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25849793 + 25849794.

It is an arithmetic number, because the mean of its divisors is an integer number (25849794).

Almost surely, 2^51699587 is an apocalyptic number.

51699587 is a deficient number, since it is larger than the sum of its proper divisors (1).

51699587 is an equidigital number, since it uses as much as digits as its factorization.

51699587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 51699587 is about 7190.2424854799. The cubic root of 51699587 is about 372.5309482867.

The spelling of 51699587 in words is "fifty-one million, six hundred ninety-nine thousand, five hundred eighty-seven".