167978513 has 8 divisors (see below), whose sum is σ = 177983208. Its totient is φ = 157987584.

The previous prime is 167978507. The next prime is 167978519. The reversal of 167978513 is 315879761.

It is an interprime number because it is at equal distance from previous prime (167978507) and next prime (167978519).

It can be written as a sum of positive squares in 4 ways, for example, as 66210769 + 101767744 = 8137^2 + 10088^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 167978513 - 2⁸ = 167978257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167978519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32495 + ... + 37307.

It is an arithmetic number, because the mean of its divisors is an integer number (22247901).

Almost surely, 2^167978513 is an apocalyptic number.

It is an amenable number.

167978513 is a deficient number, since it is larger than the sum of its proper divisors (10004695).

167978513 is a wasteful number, since it uses less digits than its factorization.

167978513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883.

The product of its digits is 317520, while the sum is 47.

The square root of 167978513 is about 12960.6524912907. The cubic root of 167978513 is about 551.7613100654.

The spelling of 167978513 in words is "one hundred sixty-seven million, nine hundred seventy-eight thousand, five hundred thirteen".