87433813 has 2 divisors, whose sum is σ = 87433814. Its totient is φ = 87433812.

The previous prime is 87433799. The next prime is 87433823. The reversal of 87433813 is 31833478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59629284 + 27804529 = 7722^2 + 5273^2 .

It is a cyclic number.

It is not a de Polignac number, because 87433813 - 2¹⁷ = 87302741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87433823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43716906 + 43716907.

It is an arithmetic number, because the mean of its divisors is an integer number (43716907).

Almost surely, 2^87433813 is an apocalyptic number.

It is an amenable number.

87433813 is a deficient number, since it is larger than the sum of its proper divisors (1).

87433813 is an equidigital number, since it uses as much as digits as its factorization.

87433813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 87433813 is about 9350.6049536915. The cubic root of 87433813 is about 443.8400341548.

The spelling of 87433813 in words is "eighty-seven million, four hundred thirty-three thousand, eight hundred thirteen".