87031381 has 16 divisors (see below), whose sum is σ = 97536960. Its totient is φ = 77172480.

The previous prime is 87031369. The next prime is 87031423. The reversal of 87031381 is 18313078.

It is a cyclic number.

It is not a de Polignac number, because 87031381 - 2¹¹ = 87029333 is a prime.

It is a super-2 number, since 2×87031381² = 15148922557534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87031331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67515 + ... + 68791.

It is an arithmetic number, because the mean of its divisors is an integer number (6096060).

Almost surely, 2^87031381 is an apocalyptic number.

It is an amenable number.

87031381 is a deficient number, since it is larger than the sum of its proper divisors (10505579).

87031381 is a wasteful number, since it uses less digits than its factorization.

87031381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 87031381 is about 9329.0610995963. The cubic root of 87031381 is about 443.1580318974.

The spelling of 87031381 in words is "eighty-seven million, thirty-one thousand, three hundred eighty-one".