987157 has 4 divisors (see below), whose sum is σ = 1011276. Its totient is φ = 963040.

The previous prime is 987143. The next prime is 987191. The reversal of 987157 is 751789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751789 = 113 ⋅6653.

It can be written as a sum of positive squares in 2 ways, for example, as 481636 + 505521 = 694^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 987157 - 2⁷ = 987029 is a prime.

It is a Duffinian number.

987157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987127) 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, 11998 + ... + 12079.

It is an arithmetic number, because the mean of its divisors is an integer number (252819).

2⁹⁸⁷¹⁵⁷ is an apocalyptic number.

It is an amenable number.

987157 is a deficient number, since it is larger than the sum of its proper divisors (24119).

987157 is a wasteful number, since it uses less digits than its factorization.

987157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24118.

The product of its digits is 17640, while the sum is 37.

The square root of 987157 is about 993.5577486991. The cubic root of 987157 is about 99.5700541146.

The spelling of 987157 in words is "nine hundred eighty-seven thousand, one hundred fifty-seven".