161478251 has 8 divisors (see below), whose sum is σ = 177615408. Its totient is φ = 146797200.

The previous prime is 161478203. The next prime is 161478253. The reversal of 161478251 is 152874161.

It is not a de Polignac number, because 161478251 - 2²² = 157283947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161478253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59330 + ... + 61991.

It is an arithmetic number, because the mean of its divisors is an integer number (22201926).

Almost surely, 2^161478251 is an apocalyptic number.

161478251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161478251 is a deficient number, since it is larger than the sum of its proper divisors (16137157).

161478251 is an equidigital number, since it uses as much as digits as its factorization.

161478251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121354 (or 121332 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 161478251 is about 12707.4092953678. The cubic root of 161478251 is about 544.5503133455.

The spelling of 161478251 in words is "one hundred sixty-one million, four hundred seventy-eight thousand, two hundred fifty-one".