87121573 has 12 divisors (see below), whose sum is σ = 109443040. Its totient is φ = 67886280.

The previous prime is 87121571. The next prime is 87121591. The reversal of 87121573 is 37512178.

It is not a de Polignac number, because 87121573 - 2¹ = 87121571 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50583 + ... + 52276.

Almost surely, 2^87121573 is an apocalyptic number.

It is an amenable number.

87121573 is a deficient number, since it is larger than the sum of its proper divisors (22321467).

87121573 is a wasteful number, since it uses less digits than its factorization.

87121573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102888 (or 102877 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 87121573 is about 9333.8937748402. The cubic root of 87121573 is about 443.3110629450.

The spelling of 87121573 in words is "eighty-seven million, one hundred twenty-one thousand, five hundred seventy-three".