213769961 has 2 divisors, whose sum is σ = 213769962. Its totient is φ = 213769960.

The previous prime is 213769891. The next prime is 213769967. The reversal of 213769961 is 169967312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213160000 + 609961 = 14600^2 + 781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213769961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213769967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106884980 + 106884981.

It is an arithmetic number, because the mean of its divisors is an integer number (106884981).

Almost surely, 2^213769961 is an apocalyptic number.

It is an amenable number.

213769961 is a deficient number, since it is larger than the sum of its proper divisors (1).

213769961 is an equidigital number, since it uses as much as digits as its factorization.

213769961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 213769961 is about 14620.8741530731. The cubic root of 213769961 is about 597.9280020179.

The spelling of 213769961 in words is "two hundred thirteen million, seven hundred sixty-nine thousand, nine hundred sixty-one".