612171157 has 8 divisors (see below), whose sum is σ = 660244536. Its totient is φ = 564238272.

The previous prime is 612171143. The next prime is 612171187. The reversal of 612171157 is 751171216.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 237129201 + 375041956 = 15399^2 + 19366^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-612171157 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 (612171107) 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, 25978 + ... + 43579.

It is an arithmetic number, because the mean of its divisors is an integer number (82530567).

Almost surely, 2^612171157 is an apocalyptic number.

It is an amenable number.

612171157 is a deficient number, since it is larger than the sum of its proper divisors (48073379).

612171157 is a wasteful number, since it uses less digits than its factorization.

612171157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70247.

The product of its digits is 2940, while the sum is 31.

The square root of 612171157 is about 24742.0928177064. The cubic root of 612171157 is about 849.0976153517.

The spelling of 612171157 in words is "six hundred twelve million, one hundred seventy-one thousand, one hundred fifty-seven".