161247810 has 16 divisors (see below), whose sum is σ = 386994816. Its totient is φ = 42999408.

The previous prime is 161247799. The next prime is 161247817. The reversal of 161247810 is 18742161.

It is a super-2 number, since 2×161247810² = 52001712459592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 5374927 = 161247810 / (1 + 6 + 1 + 2 + 4 + 7 + 8 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (161247817) 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, 2687434 + ... + 2687493.

It is an arithmetic number, because the mean of its divisors is an integer number (24187176).

Almost surely, 2^161247810 is an apocalyptic number.

161247810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161247810 is an abundant number, since it is smaller than the sum of its proper divisors (225747006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161247810 is a wasteful number, since it uses less digits than its factorization.

161247810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374937.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 161247810 is about 12698.3388677417. The cubic root of 161247810 is about 544.2911526264.

Adding to 161247810 its reverse (18742161), we get a palindrome (179989971).

The spelling of 161247810 in words is "one hundred sixty-one million, two hundred forty-seven thousand, eight hundred ten".