997387949 has 2 divisors, whose sum is σ = 997387950. Its totient is φ = 997387948.

The previous prime is 997387921. The next prime is 997387997. The reversal of 997387949 is 949783799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972816100 + 24571849 = 31190^2 + 4957^2 .

It is a cyclic number.

It is not a de Polignac number, because 997387949 - 2¹⁶ = 997322413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997387049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498693974 + 498693975.

It is an arithmetic number, because the mean of its divisors is an integer number (498693975).

Almost surely, 2^997387949 is an apocalyptic number.

It is an amenable number.

997387949 is a deficient number, since it is larger than the sum of its proper divisors (1).

997387949 is an equidigital number, since it uses as much as digits as its factorization.

997387949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30862944, while the sum is 65.

The square root of 997387949 is about 31581.4494442545. The cubic root of 997387949 is about 999.1285571413.

The spelling of 997387949 in words is "nine hundred ninety-seven million, three hundred eighty-seven thousand, nine hundred forty-nine".