861950387 has 2 divisors, whose sum is σ = 861950388. Its totient is φ = 861950386.

The previous prime is 861950329. The next prime is 861950399. The reversal of 861950387 is 783059168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861950387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (861950317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430975193 + 430975194.

It is an arithmetic number, because the mean of its divisors is an integer number (430975194).

Almost surely, 2^861950387 is an apocalyptic number.

861950387 is a deficient number, since it is larger than the sum of its proper divisors (1).

861950387 is an equidigital number, since it uses as much as digits as its factorization.

861950387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 861950387 is about 29358.9915869057. The cubic root of 861950387 is about 951.6868964667.

The spelling of 861950387 in words is "eight hundred sixty-one million, nine hundred fifty thousand, three hundred eighty-seven".