1671689953 has 2 divisors, whose sum is σ = 1671689954. Its totient is φ = 1671689952.

The previous prime is 1671689947. The next prime is 1671689963. The reversal of 1671689953 is 3599861761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962426529 + 709263424 = 31023^2 + 26632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671689953 is a prime.

It is a super-2 number, since 2×1671689953² = 5589094597922284418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1671689894 and 1671689903.

It is not a weakly prime, because it can be changed into another prime (1671689963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835844976 + 835844977.

It is an arithmetic number, because the mean of its divisors is an integer number (835844977).

Almost surely, 2^1671689953 is an apocalyptic number.

It is an amenable number.

1671689953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671689953 is an equidigital number, since it uses as much as digits as its factorization.

1671689953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 1671689953 is about 40886.3052011306. The cubic root of 1671689953 is about 1186.8210596977.

The spelling of 1671689953 in words is "one billion, six hundred seventy-one million, six hundred eighty-nine thousand, nine hundred fifty-three".