121785401 has 2 divisors, whose sum is σ = 121785402. Its totient is φ = 121785400.

The previous prime is 121785359. The next prime is 121785409. The reversal of 121785401 is 104587121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 7295401 = 10700^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 121785401 - 2²⁶ = 54676537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121785409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60892700 + 60892701.

It is an arithmetic number, because the mean of its divisors is an integer number (60892701).

Almost surely, 2^121785401 is an apocalyptic number.

It is an amenable number.

121785401 is a deficient number, since it is larger than the sum of its proper divisors (1).

121785401 is an equidigital number, since it uses as much as digits as its factorization.

121785401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 121785401 is about 11035.6423011984. The cubic root of 121785401 is about 495.6765920372.

The spelling of 121785401 in words is "one hundred twenty-one million, seven hundred eighty-five thousand, four hundred one".