159649997 has 4 divisors (see below), whose sum is σ = 171930780. Its totient is φ = 147369216.

The previous prime is 159649991. The next prime is 159650041. The reversal of 159649997 is 799946951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 137616361 = 4694^2 + 11731^2 .

It is a cyclic number.

It is not a de Polignac number, because 159649997 - 2²² = 155455693 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 (159649991) 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, 6140372 + ... + 6140397.

It is an arithmetic number, because the mean of its divisors is an integer number (42982695).

Almost surely, 2^159649997 is an apocalyptic number.

It is an amenable number.

159649997 is a deficient number, since it is larger than the sum of its proper divisors (12280783).

159649997 is a wasteful number, since it uses less digits than its factorization.

159649997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12280782.

The product of its digits is 5511240, while the sum is 59.

The square root of 159649997 is about 12635.2679829120. The cubic root of 159649997 is about 542.4873783581.

The spelling of 159649997 in words is "one hundred fifty-nine million, six hundred forty-nine thousand, nine hundred ninety-seven".