971922387 has 4 divisors (see below), whose sum is σ = 1295896520. Its totient is φ = 647948256.

The previous prime is 971922383. The next prime is 971922389. The reversal of 971922387 is 783229179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783229179 = 3 ⋅261076393.

It is not a de Polignac number, because 971922387 - 2² = 971922383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971922383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161987062 + ... + 161987067.

It is an arithmetic number, because the mean of its divisors is an integer number (323974130).

Almost surely, 2^971922387 is an apocalyptic number.

971922387 is a deficient number, since it is larger than the sum of its proper divisors (323974133).

971922387 is a wasteful number, since it uses less digits than its factorization.

971922387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323974132.

The product of its digits is 381024, while the sum is 48.

The square root of 971922387 is about 31175.6697923236. The cubic root of 971922387 is about 990.5518084852.

The spelling of 971922387 in words is "nine hundred seventy-one million, nine hundred twenty-two thousand, three hundred eighty-seven".