1225990043 has 2 divisors, whose sum is σ = 1225990044. Its totient is φ = 1225990042.

The previous prime is 1225990021. The next prime is 1225990097. The reversal of 1225990043 is 3400995221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225990043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225989985 and 1225990012.

It is not a weakly prime, because it can be changed into another prime (1225996043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612995021 + 612995022.

It is an arithmetic number, because the mean of its divisors is an integer number (612995022).

Almost surely, 2^1225990043 is an apocalyptic number.

1225990043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225990043 is an equidigital number, since it uses as much as digits as its factorization.

1225990043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1225990043 is about 35014.1406149001. The cubic root of 1225990043 is about 1070.2756569894.

The spelling of 1225990043 in words is "one billion, two hundred twenty-five million, nine hundred ninety thousand, forty-three".