15361781 has 2 divisors, whose sum is σ = 15361782. Its totient is φ = 15361780.

The previous prime is 15361763. The next prime is 15361789. The reversal of 15361781 is 18716351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 5564881 = 3130^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 15361781 - 2²² = 11167477 is a prime.

It is a super-2 number, since 2×15361781² = 471968630983922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15361789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7680890 + 7680891.

It is an arithmetic number, because the mean of its divisors is an integer number (7680891).

Almost surely, 2^15361781 is an apocalyptic number.

It is an amenable number.

15361781 is a deficient number, since it is larger than the sum of its proper divisors (1).

15361781 is an equidigital number, since it uses as much as digits as its factorization.

15361781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 15361781 is about 3919.4107975562. The cubic root of 15361781 is about 248.5882077111.

The spelling of 15361781 in words is "fifteen million, three hundred sixty-one thousand, seven hundred eighty-one".