87742261 has 2 divisors, whose sum is σ = 87742262. Its totient is φ = 87742260.

The previous prime is 87742229. The next prime is 87742267. The reversal of 87742261 is 16224778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80820100 + 6922161 = 8990^2 + 2631^2 .

It is a cyclic number.

It is not a de Polignac number, because 87742261 - 2⁵ = 87742229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87742261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87742267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43871130 + 43871131.

It is an arithmetic number, because the mean of its divisors is an integer number (43871131).

Almost surely, 2^87742261 is an apocalyptic number.

It is an amenable number.

87742261 is a deficient number, since it is larger than the sum of its proper divisors (1).

87742261 is an equidigital number, since it uses as much as digits as its factorization.

87742261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 37.

The square root of 87742261 is about 9367.0839112287. The cubic root of 87742261 is about 444.3613461978.

The spelling of 87742261 in words is "eighty-seven million, seven hundred forty-two thousand, two hundred sixty-one".