1249859161 has 2 divisors, whose sum is σ = 1249859162. Its totient is φ = 1249859160.

The previous prime is 1249859153. The next prime is 1249859173. The reversal of 1249859161 is 1619589421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 693795600 + 556063561 = 26340^2 + 23581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249859161 - 2³ = 1249859153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249859111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624929580 + 624929581.

It is an arithmetic number, because the mean of its divisors is an integer number (624929581).

Almost surely, 2^1249859161 is an apocalyptic number.

It is an amenable number.

1249859161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249859161 is an equidigital number, since it uses as much as digits as its factorization.

1249859161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 1249859161 is about 35353.3472389815. The cubic root of 1249859161 is about 1077.1768863728.

The spelling of 1249859161 in words is "one billion, two hundred forty-nine million, eight hundred fifty-nine thousand, one hundred sixty-one".