120691649 has 32 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 99348480.

The previous prime is 120691643. The next prime is 120691651. The reversal of 120691649 is 946196021.

120691649 = T₁ + T₂ + ... + T₈₉₇.

120691649 is a nontrivial binomial coefficient, being equal to C(899, 3).

It is a cyclic number.

It is not a de Polignac number, because 120691649 - 2¹⁶ = 120626113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120691643) by changing a digit.

It is the 897-th tetrahedral number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268577 + ... + 269025.

It is an arithmetic number, because the mean of its divisors is an integer number (4536000).

Almost surely, 2^120691649 is an apocalyptic number.

It is an amenable number.

120691649 is a deficient number, since it is larger than the sum of its proper divisors (24460351).

120691649 is a wasteful number, since it uses less digits than its factorization.

120691649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 120691649 is about 10985.9751046505. The cubic root of 120691649 is about 494.1882406412.

The spelling of 120691649 in words is "one hundred twenty million, six hundred ninety-one thousand, six hundred forty-nine".