1406623651 has 2 divisors, whose sum is σ = 1406623652. Its totient is φ = 1406623650.

The previous prime is 1406623649. The next prime is 1406623703. The reversal of 1406623651 is 1563266041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1406623651 - 2¹ = 1406623649 is a prime.

Together with 1406623649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1406624651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703311825 + 703311826.

It is an arithmetic number, because the mean of its divisors is an integer number (703311826).

Almost surely, 2^1406623651 is an apocalyptic number.

1406623651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406623651 is an equidigital number, since it uses as much as digits as its factorization.

1406623651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1406623651 is about 37504.9816824379. The cubic root of 1406623651 is about 1120.4504063773.

Adding to 1406623651 its reverse (1563266041), we get a palindrome (2969889692).

The spelling of 1406623651 in words is "one billion, four hundred six million, six hundred twenty-three thousand, six hundred fifty-one".