121531901 has 2 divisors, whose sum is σ = 121531902. Its totient is φ = 121531900.

The previous prime is 121531867. The next prime is 121531909. The reversal of 121531901 is 109135121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 42588676 = 8885^2 + 6526^2 .

It is a cyclic number.

It is not a de Polignac number, because 121531901 - 2¹⁴ = 121515517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121531909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60765950 + 60765951.

It is an arithmetic number, because the mean of its divisors is an integer number (60765951).

Almost surely, 2^121531901 is an apocalyptic number.

It is an amenable number.

121531901 is a deficient number, since it is larger than the sum of its proper divisors (1).

121531901 is an equidigital number, since it uses as much as digits as its factorization.

121531901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 121531901 is about 11024.1508062980. The cubic root of 121531901 is about 495.3324311875.

The spelling of 121531901 in words is "one hundred twenty-one million, five hundred thirty-one thousand, nine hundred one".