7161987 has 24 divisors (see below), whose sum is σ = 11261376. Its totient is φ = 4036368.

The previous prime is 7161971. The next prime is 7161991. The reversal of 7161987 is 7891617.

It is not a de Polignac number, because 7161987 - 2⁴ = 7161971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7161937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11908 + ... + 12494.

It is an arithmetic number, because the mean of its divisors is an integer number (469224).

Almost surely, 2^7161987 is an apocalyptic number.

7161987 is a deficient number, since it is larger than the sum of its proper divisors (4099389).

7161987 is a wasteful number, since it uses less digits than its factorization.

7161987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 680 counting only the distinct ones).

The product of its digits is 21168, while the sum is 39.

The square root of 7161987 is about 2676.1888946784. The cubic root of 7161987 is about 192.7574516710.

The spelling of 7161987 in words is "seven million, one hundred sixty-one thousand, nine hundred eighty-seven".