695781001 has 4 divisors (see below), whose sum is σ = 695870532. Its totient is φ = 695691472.

The previous prime is 695780999. The next prime is 695781059. The reversal of 695781001 is 100187596.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388129401 + 307651600 = 19701^2 + 17540^2 .

It is a cyclic number.

It is not a de Polignac number, because 695781001 - 2¹ = 695780999 is a prime.

It is a super-2 number, since 2×695781001² = 968222402705124002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (695781061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31870 + ... + 49063.

It is an arithmetic number, because the mean of its divisors is an integer number (173967633).

Almost surely, 2^695781001 is an apocalyptic number.

It is an amenable number.

695781001 is a deficient number, since it is larger than the sum of its proper divisors (89531).

695781001 is an equidigital number, since it uses as much as digits as its factorization.

695781001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89530.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 695781001 is about 26377.6610221604. The cubic root of 695781001 is about 886.1165648756.

The spelling of 695781001 in words is "six hundred ninety-five million, seven hundred eighty-one thousand, one".