153999961 has 2 divisors, whose sum is σ = 153999962. Its totient is φ = 153999960.

The previous prime is 153999953. The next prime is 153999983. The reversal of 153999961 is 169999351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152374336 + 1625625 = 12344^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 153999961 - 2³ = 153999953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 153999899 and 153999908.

It is not a weakly prime, because it can be changed into another prime (153999941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76999980 + 76999981.

It is an arithmetic number, because the mean of its divisors is an integer number (76999981).

Almost surely, 2^153999961 is an apocalyptic number.

It is an amenable number.

153999961 is a deficient number, since it is larger than the sum of its proper divisors (1).

153999961 is an equidigital number, since it uses as much as digits as its factorization.

153999961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 590490, while the sum is 52.

The square root of 153999961 is about 12409.6720746360. The cubic root of 153999961 is about 536.0107958489.

The spelling of 153999961 in words is "one hundred fifty-three million, nine hundred ninety-nine thousand, nine hundred sixty-one".