1021690001 has 2 divisors, whose sum is σ = 1021690002. Its totient is φ = 1021690000.

The previous prime is 1021689997. The next prime is 1021690003. The reversal of 1021690001 is 1000961201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644398225 + 377291776 = 25385^2 + 19424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021690001 - 2² = 1021689997 is a prime.

Together with 1021690003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1021690003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510845000 + 510845001.

It is an arithmetic number, because the mean of its divisors is an integer number (510845001).

Almost surely, 2^1021690001 is an apocalyptic number.

It is an amenable number.

1021690001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021690001 is an equidigital number, since it uses as much as digits as its factorization.

1021690001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1021690001 is about 31963.8858870445. The cubic root of 1021690001 is about 1007.1783483513.

The spelling of 1021690001 in words is "one billion, twenty-one million, six hundred ninety thousand, one".