87120001 has 4 divisors (see below), whose sum is σ = 87533104. Its totient is φ = 86706900.

The previous prime is 87119987. The next prime is 87120029. The reversal of 87120001 is 10002178.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10002178 = 2 ⋅5001089.

It is a cyclic number.

It is not a de Polignac number, because 87120001 - 2⁹ = 87119489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87120091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206235 + ... + 206656.

It is an arithmetic number, because the mean of its divisors is an integer number (21883276).

Almost surely, 2^87120001 is an apocalyptic number.

It is an amenable number.

87120001 is a deficient number, since it is larger than the sum of its proper divisors (413103).

87120001 is a wasteful number, since it uses less digits than its factorization.

87120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413102.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 87120001 is about 9333.8095652311. The cubic root of 87120001 is about 443.3083965974.

Adding to 87120001 its reverse (10002178), we get a palindrome (97122179).

The spelling of 87120001 in words is "eighty-seven million, one hundred twenty thousand, one".