697019381 has 2 divisors, whose sum is σ = 697019382. Its totient is φ = 697019380.

The previous prime is 697019371. The next prime is 697019413. The reversal of 697019381 is 183910796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654899281 + 42120100 = 25591^2 + 6490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697019381 is a prime.

It is a super-2 number, since 2×697019381² = 971672034979246322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697019341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348509690 + 348509691.

It is an arithmetic number, because the mean of its divisors is an integer number (348509691).

Almost surely, 2^697019381 is an apocalyptic number.

It is an amenable number.

697019381 is a deficient number, since it is larger than the sum of its proper divisors (1).

697019381 is an equidigital number, since it uses as much as digits as its factorization.

697019381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 697019381 is about 26401.1246161977. The cubic root of 697019381 is about 886.6419690076.

The spelling of 697019381 in words is "six hundred ninety-seven million, nineteen thousand, three hundred eighty-one".