121946551 has 2 divisors, whose sum is σ = 121946552. Its totient is φ = 121946550.

The previous prime is 121946519. The next prime is 121946563. The reversal of 121946551 is 155649121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121946551 - 2⁵ = 121946519 is a prime.

It is a super-2 number, since 2×121946551² = 29741922601591202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121946501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60973275 + 60973276.

It is an arithmetic number, because the mean of its divisors is an integer number (60973276).

Almost surely, 2^121946551 is an apocalyptic number.

121946551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121946551 is an equidigital number, since it uses as much as digits as its factorization.

121946551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 121946551 is about 11042.9412295819. The cubic root of 121946551 is about 495.8951269234.

The spelling of 121946551 in words is "one hundred twenty-one million, nine hundred forty-six thousand, five hundred fifty-one".