121551457 has 2 divisors, whose sum is σ = 121551458. Its totient is φ = 121551456.

The previous prime is 121551449. The next prime is 121551509. The reversal of 121551457 is 754155121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72607441 + 48944016 = 8521^2 + 6996^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551457 - 2³ = 121551449 is a prime.

It is not a weakly prime, because it can be changed into another prime (121551407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775728 + 60775729.

It is an arithmetic number, because the mean of its divisors is an integer number (60775729).

Almost surely, 2^121551457 is an apocalyptic number.

It is an amenable number.

121551457 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551457 is an equidigital number, since it uses as much as digits as its factorization.

121551457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7000, while the sum is 31.

The square root of 121551457 is about 11025.0377323617. The cubic root of 121551457 is about 495.3589981531.

The spelling of 121551457 in words is "one hundred twenty-one million, five hundred fifty-one thousand, four hundred fifty-seven".