163487731 has 4 divisors (see below), whose sum is σ = 178350264. Its totient is φ = 148625200.

The previous prime is 163487729. The next prime is 163487743. The reversal of 163487731 is 137784361.

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

It is a cyclic number.

It is not a de Polignac number, because 163487731 - 2¹ = 163487729 is a prime.

It is a super-2 number, since 2×163487731² = 53456476375056722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163487771) 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, 7431250 + ... + 7431271.

It is an arithmetic number, because the mean of its divisors is an integer number (44587566).

Almost surely, 2^163487731 is an apocalyptic number.

163487731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163487731 is a deficient number, since it is larger than the sum of its proper divisors (14862533).

163487731 is a wasteful number, since it uses less digits than its factorization.

163487731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14862532.

The product of its digits is 84672, while the sum is 40.

The square root of 163487731 is about 12786.2320876793. The cubic root of 163487731 is about 546.7998525793.

The spelling of 163487731 in words is "one hundred sixty-three million, four hundred eighty-seven thousand, seven hundred thirty-one".