87831511 has 2 divisors, whose sum is σ = 87831512. Its totient is φ = 87831510.

The previous prime is 87831467. The next prime is 87831529. The reversal of 87831511 is 11513878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87831511 - 2¹³ = 87823319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87831551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43915755 + 43915756.

It is an arithmetic number, because the mean of its divisors is an integer number (43915756).

Almost surely, 2^87831511 is an apocalyptic number.

87831511 is a deficient number, since it is larger than the sum of its proper divisors (1).

87831511 is an equidigital number, since it uses as much as digits as its factorization.

87831511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 87831511 is about 9371.8467230317. The cubic root of 87831511 is about 444.5119608517.

The spelling of 87831511 in words is "eighty-seven million, eight hundred thirty-one thousand, five hundred eleven".