198621707 has 2 divisors, whose sum is σ = 198621708. Its totient is φ = 198621706.

The previous prime is 198621697. The next prime is 198621713. The reversal of 198621707 is 707126891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198621707 - 2¹⁰ = 198620683 is a prime.

It is not a weakly prime, because it can be changed into another prime (198621757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99310853 + 99310854.

It is an arithmetic number, because the mean of its divisors is an integer number (99310854).

Almost surely, 2^198621707 is an apocalyptic number.

198621707 is a deficient number, since it is larger than the sum of its proper divisors (1).

198621707 is an equidigital number, since it uses as much as digits as its factorization.

198621707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 198621707 is about 14093.3213615528. The cubic root of 198621707 is about 583.4570654175.

The spelling of 198621707 in words is "one hundred ninety-eight million, six hundred twenty-one thousand, seven hundred seven".