121431257 has 2 divisors, whose sum is σ = 121431258. Its totient is φ = 121431256.

The previous prime is 121431239. The next prime is 121431281. The reversal of 121431257 is 752134121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104939536 + 16491721 = 10244^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 121431257 - 2¹² = 121427161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121431157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60715628 + 60715629.

It is an arithmetic number, because the mean of its divisors is an integer number (60715629).

Almost surely, 2^121431257 is an apocalyptic number.

It is an amenable number.

121431257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121431257 is an equidigital number, since it uses as much as digits as its factorization.

121431257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 121431257 is about 11019.5851555310. The cubic root of 121431257 is about 495.1956605002.

Adding to 121431257 its reverse (752134121), we get a palindrome (873565378).

The spelling of 121431257 in words is "one hundred twenty-one million, four hundred thirty-one thousand, two hundred fifty-seven".