101405042 has 4 divisors (see below), whose sum is σ = 152107566. Its totient is φ = 50702520.

The previous prime is 101405041. The next prime is 101405047. The reversal of 101405042 is 240504101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240504101 = 197 ⋅1220833.

It can be written as a sum of positive squares in only one way, i.e., 71385601 + 30019441 = 8449^2 + 5479^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101405042.

It is not an unprimeable number, because it can be changed into a prime (101405041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25351259 + ... + 25351262.

Almost surely, 2^101405042 is an apocalyptic number.

101405042 is a deficient number, since it is larger than the sum of its proper divisors (50702524).

101405042 is an equidigital number, since it uses as much as digits as its factorization.

101405042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50702523.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 101405042 is about 10070.0070506430. The cubic root of 101405042 is about 466.3226565610.

Adding to 101405042 its reverse (240504101), we get a palindrome (341909143).

The spelling of 101405042 in words is "one hundred one million, four hundred five thousand, forty-two".