1139195921 has 2 divisors, whose sum is σ = 1139195922. Its totient is φ = 1139195920.

The previous prime is 1139195881. The next prime is 1139195929. The reversal of 1139195921 is 1295919311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1026305296 + 112890625 = 32036^2 + 10625^2 .

It is an emirp because it is prime and its reverse (1295919311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1139195921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1139195929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569597960 + 569597961.

It is an arithmetic number, because the mean of its divisors is an integer number (569597961).

Almost surely, 2^1139195921 is an apocalyptic number.

It is an amenable number.

1139195921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139195921 is an equidigital number, since it uses as much as digits as its factorization.

1139195921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 41.

The square root of 1139195921 is about 33751.9765495297. The cubic root of 1139195921 is about 1044.3982619659.

The spelling of 1139195921 in words is "one billion, one hundred thirty-nine million, one hundred ninety-five thousand, nine hundred twenty-one".