1697625949 has 2 divisors, whose sum is σ = 1697625950. Its totient is φ = 1697625948.

The previous prime is 1697625911. The next prime is 1697625959. The reversal of 1697625949 is 9495267961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040062500 + 657563449 = 32250^2 + 25643^2 .

It is an emirp because it is prime and its reverse (9495267961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1697625949 - 2⁹ = 1697625437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1697625893 and 1697625902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1697625959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848812974 + 848812975.

It is an arithmetic number, because the mean of its divisors is an integer number (848812975).

Almost surely, 2^1697625949 is an apocalyptic number.

It is an amenable number.

1697625949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1697625949 is an equidigital number, since it uses as much as digits as its factorization.

1697625949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 58.

The square root of 1697625949 is about 41202.2566008222. The cubic root of 1697625949 is about 1192.9273664503.

The spelling of 1697625949 in words is "one billion, six hundred ninety-seven million, six hundred twenty-five thousand, nine hundred forty-nine".