1561151 has 2 divisors, whose sum is σ = 1561152. Its totient is φ = 1561150.
The previous prime is 1561139. The next prime is 1561159. The reversal of 1561151 is 1511651.
It is a strong prime.
It is an emirp because it is prime and its reverse (1511651) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1561151 - 210 = 1560127 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1561159) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780575 + 780576.
It is an arithmetic number, because the mean of its divisors is an integer number (780576).
21561151 is an apocalyptic number.
1561151 is a deficient number, since it is larger than the sum of its proper divisors (1).
1561151 is an equidigital number, since it uses as much as digits as its factorization.
1561151 is an evil number, because the sum of its binary digits is even.
The product of its digits is 150, while the sum is 20.
The square root of 1561151 is about 1249.4602834824. The cubic root of 1561151 is about 116.0063165407.
The spelling of 1561151 in words is "one million, five hundred sixty-one thousand, one hundred fifty-one".
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