121355431 has 2 divisors, whose sum is σ = 121355432. Its totient is φ = 121355430.

The previous prime is 121355411. The next prime is 121355447. The reversal of 121355431 is 134553121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121355431 - 2¹⁷ = 121224359 is a prime.

It is a super-2 number, since 2×121355431² = 29454281266391522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121355396 and 121355405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121355411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60677715 + 60677716.

It is an arithmetic number, because the mean of its divisors is an integer number (60677716).

Almost surely, 2^121355431 is an apocalyptic number.

121355431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121355431 is an equidigital number, since it uses as much as digits as its factorization.

121355431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 121355431 is about 11016.1441076268. The cubic root of 121355431 is about 495.0925664387.

It can be divided in two parts, 1213 and 55431, that added together give a square (56644 = 238²).

The spelling of 121355431 in words is "one hundred twenty-one million, three hundred fifty-five thousand, four hundred thirty-one".