972191377 has 2 divisors, whose sum is σ = 972191378. Its totient is φ = 972191376.

The previous prime is 972191371. The next prime is 972191399. The reversal of 972191377 is 773191279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866183761 + 106007616 = 29431^2 + 10296^2 .

It is a cyclic number.

It is not a de Polignac number, because 972191377 - 2⁷ = 972191249 is a prime.

It is a super-2 number, since 2×972191377² = 1890312147026312258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (972191371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486095688 + 486095689.

It is an arithmetic number, because the mean of its divisors is an integer number (486095689).

Almost surely, 2^972191377 is an apocalyptic number.

It is an amenable number.

972191377 is a deficient number, since it is larger than the sum of its proper divisors (1).

972191377 is an equidigital number, since it uses as much as digits as its factorization.

972191377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 166698, while the sum is 46.

The square root of 972191377 is about 31179.9835952491. The cubic root of 972191377 is about 990.6431820206.

It can be divided in two parts, 97219 and 1377, that added together give a square (98596 = 314²).

The spelling of 972191377 in words is "nine hundred seventy-two million, one hundred ninety-one thousand, three hundred seventy-seven".