978157 has 2 divisors, whose sum is σ = 978158. Its totient is φ = 978156.

The previous prime is 978151. The next prime is 978179. The reversal of 978157 is 751879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 978121 + 36 = 989^2 + 6^2 .

It is an emirp because it is prime and its reverse (751879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978157 - 2³ = 978149 is a prime.

It is a super-2 number, since 2×978157² = 1913582233298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489078 + 489079.

It is an arithmetic number, because the mean of its divisors is an integer number (489079).

2⁹⁷⁸¹⁵⁷ is an apocalyptic number.

It is an amenable number.

978157 is a deficient number, since it is larger than the sum of its proper divisors (1).

978157 is an equidigital number, since it uses as much as digits as its factorization.

978157 is an evil number, because the sum of its binary digits is even.

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

The square root of 978157 is about 989.0182000348. The cubic root of 978157 is about 99.2665334206.

The spelling of 978157 in words is "nine hundred seventy-eight thousand, one hundred fifty-seven".