15122122261 has 2 divisors, whose sum is σ = 15122122262. Its totient is φ = 15122122260.

The previous prime is 15122122247. The next prime is 15122122273. The reversal of 15122122261 is 16222122151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14994002500 + 128119761 = 122450^2 + 11319^2 .

It is a cyclic number.

It is not a de Polignac number, because 15122122261 - 2⁵ = 15122122229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15122122661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561061130 + 7561061131.

It is an arithmetic number, because the mean of its divisors is an integer number (7561061131).

Almost surely, 2^15122122261 is an apocalyptic number.

It is an amenable number.

15122122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15122122261 is an equidigital number, since it uses as much as digits as its factorization.

15122122261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 25.

The spelling of 15122122261 in words is "fifteen billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred sixty-one".