87138951 has 4 divisors (see below), whose sum is σ = 116185272. Its totient is φ = 58092632.

The previous prime is 87138949. The next prime is 87138967. The reversal of 87138951 is 15983178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87138951 - 2¹ = 87138949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87138901) 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, 14523156 + ... + 14523161.

It is an arithmetic number, because the mean of its divisors is an integer number (29046318).

Almost surely, 2^87138951 is an apocalyptic number.

87138951 is a deficient number, since it is larger than the sum of its proper divisors (29046321).

87138951 is a wasteful number, since it uses less digits than its factorization.

87138951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29046320.

The product of its digits is 60480, while the sum is 42.

The square root of 87138951 is about 9334.8246368103. The cubic root of 87138951 is about 443.3405365002.

The spelling of 87138951 in words is "eighty-seven million, one hundred thirty-eight thousand, nine hundred fifty-one".