161504761 has 16 divisors (see below), whose sum is σ = 182481408. Its totient is φ = 141609600.

The previous prime is 161504753. The next prime is 161504789. The reversal of 161504761 is 167405161.

It is not a de Polignac number, because 161504761 - 2³ = 161504753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161504701) 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, 134781 + ... + 135973.

It is an arithmetic number, because the mean of its divisors is an integer number (11405088).

Almost surely, 2^161504761 is an apocalyptic number.

161504761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161504761 is a deficient number, since it is larger than the sum of its proper divisors (20976647).

161504761 is a wasteful number, since it uses less digits than its factorization.

161504761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 161504761 is about 12708.4523447979. The cubic root of 161504761 is about 544.5801114531.

The spelling of 161504761 in words is "one hundred sixty-one million, five hundred four thousand, seven hundred sixty-one".