87405553 has 2 divisors, whose sum is σ = 87405554. Its totient is φ = 87405552.

The previous prime is 87405547. The next prime is 87405599. The reversal of 87405553 is 35550478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87385104 + 20449 = 9348^2 + 143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87405553 is a prime.

It is not a weakly prime, because it can be changed into another prime (87405053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43702776 + 43702777.

It is an arithmetic number, because the mean of its divisors is an integer number (43702777).

Almost surely, 2^87405553 is an apocalyptic number.

It is an amenable number.

87405553 is a deficient number, since it is larger than the sum of its proper divisors (1).

87405553 is an equidigital number, since it uses as much as digits as its factorization.

87405553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 87405553 is about 9349.0936993914. The cubic root of 87405553 is about 443.7922102809.

The spelling of 87405553 in words is "eighty-seven million, four hundred five thousand, five hundred fifty-three".