161025134 has 4 divisors (see below), whose sum is σ = 241537704. Its totient is φ = 80512566.

The previous prime is 161025131. The next prime is 161025143. The reversal of 161025134 is 431520161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 431520161 = 61 ⋅7074101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161025131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40256282 + ... + 40256285.

It is an arithmetic number, because the mean of its divisors is an integer number (60384426).

Almost surely, 2^161025134 is an apocalyptic number.

161025134 is a deficient number, since it is larger than the sum of its proper divisors (80512570).

161025134 is an equidigital number, since it uses as much as digits as its factorization.

161025134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80512569.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161025134 is about 12689.5679201461. The cubic root of 161025134 is about 544.0404899757.

Adding to 161025134 its reverse (431520161), we get a palindrome (592545295).

The spelling of 161025134 in words is "one hundred sixty-one million, twenty-five thousand, one hundred thirty-four".