161263641 has 16 divisors (see below), whose sum is σ = 268075008. Its totient is φ = 83773200.

The previous prime is 161263541. The next prime is 161263667. The reversal of 161263641 is 146362161.

It is not a de Polignac number, because 161263641 - 2¹¹ = 161261593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161263599 and 161263608.

It is not an unprimeable number, because it can be changed into a prime (161263681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348825 + ... + 349286.

It is an arithmetic number, because the mean of its divisors is an integer number (16754688).

Almost surely, 2^161263641 is an apocalyptic number.

161263641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161263641 is a deficient number, since it is larger than the sum of its proper divisors (106811367).

161263641 is a wasteful number, since it uses less digits than its factorization.

161263641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698132.

The product of its digits is 5184, while the sum is 30.

The square root of 161263641 is about 12698.9622016919. The cubic root of 161263641 is about 544.3089645298.

The spelling of 161263641 in words is "one hundred sixty-one million, two hundred sixty-three thousand, six hundred forty-one".