121039280649 has 27 divisors (see below), whose sum is σ = 203391204237. Its totient is φ = 69161128344.

The previous prime is 121039280623. The next prime is 121039280653. The reversal of 121039280649 is 946082930121.

The square root of 121039280649 is 347907.

It is a perfect power (a square), and thus also a powerful number.

121039280649 is a `hidden beast` number, since 1 + 210 + 392 + 8 + 0 + 6 + 49 = 666.

It is not a de Polignac number, because 121039280649 - 2⁷ = 121039280521 is a prime.

It is a super-2 number, since 2×121039280649² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121039280669) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7297764 + ... + 7314330.

Almost surely, 2^121039280649 is an apocalyptic number.

121039280649 is the 347907-th square number.

121039280649 is the 173954-th centered octagonal number.

It is an amenable number.

121039280649 is a deficient number, since it is larger than the sum of its proper divisors (82351923588).

121039280649 is an frugal number, since it uses more digits than its factorization.

121039280649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33154 (or 16577 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 121039280649 in words is "one hundred twenty-one billion, thirty-nine million, two hundred eighty thousand, six hundred forty-nine".