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972991 is a prime number
BaseRepresentation
bin11101101100010111111
31211102200201
43231202333
5222113431
632504331
711161465
oct3554277
91742621
10972991
11605028
123ab0a7
13280b46
141b4835
15143461
hexed8bf

972991 has 2 divisors, whose sum is σ = 972992. Its totient is φ = 972990.

The previous prime is 972977. The next prime is 973001. The reversal of 972991 is 199279.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 972991 - 211 = 970943 is a prime.

It is a super-2 number, since 2×9729912 = 1893422972162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 972991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (972901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486495 + 486496.

It is an arithmetic number, because the mean of its divisors is an integer number (486496).

2972991 is an apocalyptic number.

972991 is the 570-th hex number.

972991 is a deficient number, since it is larger than the sum of its proper divisors (1).

972991 is an equidigital number, since it uses as much as digits as its factorization.

972991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 972991 is about 986.4030616335. The cubic root of 972991 is about 99.0914707433.

The spelling of 972991 in words is "nine hundred seventy-two thousand, nine hundred ninety-one".