153651961 has 2 divisors, whose sum is σ = 153651962. Its totient is φ = 153651960.

The previous prime is 153651877. The next prime is 153651973. The reversal of 153651961 is 169156351.

It is the 5061-st star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147476736 + 6175225 = 12144^2 + 2485^2 .

It is a cyclic number.

It is not a de Polignac number, because 153651961 - 2⁷ = 153651833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 153651961.

It is not a weakly prime, because it can be changed into another prime (153651991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76825980 + 76825981.

It is an arithmetic number, because the mean of its divisors is an integer number (76825981).

Almost surely, 2^153651961 is an apocalyptic number.

153651961 is the 5544-th centered decagonal number.

It is an amenable number.

153651961 is a deficient number, since it is larger than the sum of its proper divisors (1).

153651961 is an equidigital number, since it uses as much as digits as its factorization.

153651961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 153651961 is about 12395.6428231859. The cubic root of 153651961 is about 535.6067428502.

The spelling of 153651961 in words is "one hundred fifty-three million, six hundred fifty-one thousand, nine hundred sixty-one".