161001511 has 12 divisors (see below), whose sum is σ = 177289000. Its totient is φ = 146100240.

The previous prime is 161001493. The next prime is 161001521. The reversal of 161001511 is 115100161.

It is not a de Polignac number, because 161001511 - 2¹³ = 160993319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161001521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103165 + ... + 104713.

Almost surely, 2^161001511 is an apocalyptic number.

161001511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161001511 is a deficient number, since it is larger than the sum of its proper divisors (16287489).

161001511 is a wasteful number, since it uses less digits than its factorization.

161001511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430 (or 2419 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 161001511 is about 12688.6370820510. The cubic root of 161001511 is about 544.0138844045.

Adding to 161001511 its reverse (115100161), we get a palindrome (276101672).

The spelling of 161001511 in words is "one hundred sixty-one million, one thousand, five hundred eleven".