971622139 has 2 divisors, whose sum is σ = 971622140. Its totient is φ = 971622138.

The previous prime is 971622103. The next prime is 971622173. The reversal of 971622139 is 931226179.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 971622139 - 2¹⁵ = 971589371 is a prime.

It is equal to p_49477225 and since 971622139 and 49477225 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (971622439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485811069 + 485811070.

It is an arithmetic number, because the mean of its divisors is an integer number (485811070).

Almost surely, 2^971622139 is an apocalyptic number.

971622139 is a deficient number, since it is larger than the sum of its proper divisors (1).

971622139 is an equidigital number, since it uses as much as digits as its factorization.

971622139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 971622139 is about 31170.8539985673. The cubic root of 971622139 is about 990.4497969685.

The spelling of 971622139 in words is "nine hundred seventy-one million, six hundred twenty-two thousand, one hundred thirty-nine".