694506157 has 2 divisors, whose sum is σ = 694506158. Its totient is φ = 694506156.

The previous prime is 694506139. The next prime is 694506173. The reversal of 694506157 is 751605496.

694506157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619960201 + 74545956 = 24899^2 + 8634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-694506157 is a prime.

It is a super-2 number, since 2×694506157² = 964677604221817298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694506557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347253078 + 347253079.

It is an arithmetic number, because the mean of its divisors is an integer number (347253079).

Almost surely, 2^694506157 is an apocalyptic number.

It is an amenable number.

694506157 is a deficient number, since it is larger than the sum of its proper divisors (1).

694506157 is an equidigital number, since it uses as much as digits as its factorization.

694506157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 694506157 is about 26353.4847221387. The cubic root of 694506157 is about 885.5750386256.

The spelling of 694506157 in words is "six hundred ninety-four million, five hundred six thousand, one hundred fifty-seven".