690907501 has 2 divisors, whose sum is σ = 690907502. Its totient is φ = 690907500.

The previous prime is 690907499. The next prime is 690907517. The reversal of 690907501 is 105709096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659154276 + 31753225 = 25674^2 + 5635^2 .

It is a cyclic number.

It is not a de Polignac number, because 690907501 - 2¹ = 690907499 is a prime.

Together with 690907499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690907541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345453750 + 345453751.

It is an arithmetic number, because the mean of its divisors is an integer number (345453751).

Almost surely, 2^690907501 is an apocalyptic number.

It is an amenable number.

690907501 is a deficient number, since it is larger than the sum of its proper divisors (1).

690907501 is an equidigital number, since it uses as much as digits as its factorization.

690907501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 690907501 is about 26285.1193834078. The cubic root of 690907501 is about 884.0428226869.

The spelling of 690907501 in words is "six hundred ninety million, nine hundred seven thousand, five hundred one".