102078157 has 4 divisors (see below), whose sum is σ = 102125340. Its totient is φ = 102030976.

The previous prime is 102078143. The next prime is 102078161. The reversal of 102078157 is 751870201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751870201 = 61 ⋅12325741.

It can be written as a sum of positive squares in 2 ways, for example, as 55442916 + 46635241 = 7446^2 + 6829^2 .

It is a cyclic number.

It is not a de Polignac number, because 102078157 - 2⁷ = 102078029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102073157) 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, 20182 + ... + 24727.

It is an arithmetic number, because the mean of its divisors is an integer number (25531335).

Almost surely, 2^102078157 is an apocalyptic number.

It is an amenable number.

102078157 is a deficient number, since it is larger than the sum of its proper divisors (47183).

102078157 is an equidigital number, since it uses as much as digits as its factorization.

102078157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47182.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 102078157 is about 10103.3735455045. The cubic root of 102078157 is about 467.3521806672.

The spelling of 102078157 in words is "one hundred two million, seventy-eight thousand, one hundred fifty-seven".