87431413 has 2 divisors, whose sum is σ = 87431414. Its totient is φ = 87431412.

The previous prime is 87431401. The next prime is 87431431. The reversal of 87431413 is 31413478.

Together with next prime (87431431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84309124 + 3122289 = 9182^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 87431413 - 2⁵ = 87431381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87431213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43715706 + 43715707.

It is an arithmetic number, because the mean of its divisors is an integer number (43715707).

Almost surely, 2^87431413 is an apocalyptic number.

It is an amenable number.

87431413 is a deficient number, since it is larger than the sum of its proper divisors (1).

87431413 is an equidigital number, since it uses as much as digits as its factorization.

87431413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 87431413 is about 9350.4766188682. The cubic root of 87431413 is about 443.8359730798.

The spelling of 87431413 in words is "eighty-seven million, four hundred thirty-one thousand, four hundred thirteen".