161700542 has 4 divisors (see below), whose sum is σ = 242550816. Its totient is φ = 80850270.

The previous prime is 161700541. The next prime is 161700559. The reversal of 161700542 is 245007161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161700542² = 52294130566187528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161700541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40425134 + ... + 40425137.

It is an arithmetic number, because the mean of its divisors is an integer number (60637704).

Almost surely, 2^161700542 is an apocalyptic number.

161700542 is a deficient number, since it is larger than the sum of its proper divisors (80850274).

161700542 is an equidigital number, since it uses as much as digits as its factorization.

161700542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80850273.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 161700542 is about 12716.1527987045. The cubic root of 161700542 is about 544.8000748050.

The spelling of 161700542 in words is "one hundred sixty-one million, seven hundred thousand, five hundred forty-two".