87553493 has 2 divisors, whose sum is σ = 87553494. Its totient is φ = 87553492.

The previous prime is 87553469. The next prime is 87553511. The reversal of 87553493 is 39435578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80964004 + 6589489 = 8998^2 + 2567^2 .

It is a cyclic number.

It is not a de Polignac number, because 87553493 - 2⁶ = 87553429 is a prime.

It is a super-2 number, since 2×87553493² = 15331228273002098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87553423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43776746 + 43776747.

It is an arithmetic number, because the mean of its divisors is an integer number (43776747).

Almost surely, 2^87553493 is an apocalyptic number.

It is an amenable number.

87553493 is a deficient number, since it is larger than the sum of its proper divisors (1).

87553493 is an equidigital number, since it uses as much as digits as its factorization.

87553493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The square root of 87553493 is about 9357.0023511806. The cubic root of 87553493 is about 444.0424522485.

Subtracting from 87553493 its sum of digits (44), we obtain a square (87553449 = 9357²).

The spelling of 87553493 in words is "eighty-seven million, five hundred fifty-three thousand, four hundred ninety-three".