87661501 has 4 divisors (see below), whose sum is σ = 87707104. Its totient is φ = 87615900.

The previous prime is 87661489. The next prime is 87661517. The reversal of 87661501 is 10516678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87661501 - 2⁷ = 87661373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87661201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19785 + ... + 23806.

It is an arithmetic number, because the mean of its divisors is an integer number (21926776).

Almost surely, 2^87661501 is an apocalyptic number.

It is an amenable number.

87661501 is a deficient number, since it is larger than the sum of its proper divisors (45603).

87661501 is a wasteful number, since it uses less digits than its factorization.

87661501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45602.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 87661501 is about 9362.7720788237. The cubic root of 87661501 is about 444.2249708722.

The spelling of 87661501 in words is "eighty-seven million, six hundred sixty-one thousand, five hundred one".