121538806 has 4 divisors (see below), whose sum is σ = 182308212. Its totient is φ = 60769402.

The previous prime is 121538783. The next prime is 121538827. The reversal of 121538806 is 608835121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608835121 = 569 ⋅1070009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30384700 + ... + 30384703.

It is an arithmetic number, because the mean of its divisors is an integer number (45577053).

Almost surely, 2^121538806 is an apocalyptic number.

121538806 is a deficient number, since it is larger than the sum of its proper divisors (60769406).

121538806 is an equidigital number, since it uses as much as digits as its factorization.

121538806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60769405.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 121538806 is about 11024.4639778993. The cubic root of 121538806 is about 495.3418120048.

The spelling of 121538806 in words is "one hundred twenty-one million, five hundred thirty-eight thousand, eight hundred six".