161212623 has 16 divisors (see below), whose sum is σ = 252529536. Its totient is φ = 90188640.

The previous prime is 161212619. The next prime is 161212627. The reversal of 161212623 is 326212161.

It is an interprime number because it is at equal distance from previous prime (161212619) and next prime (161212627).

It is not a de Polignac number, because 161212623 - 2² = 161212619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161212593 and 161212602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161212627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187465 + ... + 188322.

It is an arithmetic number, because the mean of its divisors is an integer number (15783096).

Almost surely, 2^161212623 is an apocalyptic number.

161212623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161212623 is a deficient number, since it is larger than the sum of its proper divisors (91316913).

161212623 is a wasteful number, since it uses less digits than its factorization.

161212623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375814.

The product of its digits is 864, while the sum is 24.

The square root of 161212623 is about 12696.9532959683. The cubic root of 161212623 is about 544.2515585671.

Adding to 161212623 its reverse (326212161), we get a palindrome (487424784).

The spelling of 161212623 in words is "one hundred sixty-one million, two hundred twelve thousand, six hundred twenty-three".