120891649 has 6 divisors (see below), whose sum is σ = 122978930. Its totient is φ = 118839216.

The previous prime is 120891601. The next prime is 120891653. The reversal of 120891649 is 946198021.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 52664049 = 8260^2 + 7257^2 .

It is not a de Polignac number, because 120891649 - 2⁷ = 120891521 is a prime.

It is a super-2 number, since 2×120891649² = 29229581595878402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120891679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13884 + ... + 20845.

Almost surely, 2^120891649 is an apocalyptic number.

It is an amenable number.

120891649 is a deficient number, since it is larger than the sum of its proper divisors (2087281).

120891649 is an frugal number, since it uses more digits than its factorization.

120891649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34847 (or 34788 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 120891649 is about 10995.0738515028. The cubic root of 120891649 is about 494.4610656572.

The spelling of 120891649 in words is "one hundred twenty million, eight hundred ninety-one thousand, six hundred forty-nine".