1111999951 has 2 divisors, whose sum is σ = 1111999952. Its totient is φ = 1111999950.

The previous prime is 1111999939. The next prime is 1111999957. The reversal of 1111999951 is 1599991111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111999951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111999957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555999975 + 555999976.

It is an arithmetic number, because the mean of its divisors is an integer number (555999976).

Almost surely, 2^1111999951 is an apocalyptic number.

1111999951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111999951 is an equidigital number, since it uses as much as digits as its factorization.

1111999951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32805, while the sum is 46.

The square root of 1111999951 is about 33346.6632663599. The cubic root of 1111999951 is about 1036.0202782587.

The spelling of 1111999951 in words is "one billion, one hundred eleven million, nine hundred ninety-nine thousand, nine hundred fifty-one".