87813749 has 2 divisors, whose sum is σ = 87813750. Its totient is φ = 87813748.

The previous prime is 87813707. The next prime is 87813767. The reversal of 87813749 is 94731878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 8514724 = 8905^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 87813749 - 2⁸ = 87813493 is a prime.

It is a super-2 number, since 2×87813749² = 15422509026870002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87813799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43906874 + 43906875.

It is an arithmetic number, because the mean of its divisors is an integer number (43906875).

Almost surely, 2^87813749 is an apocalyptic number.

It is an amenable number.

87813749 is a deficient number, since it is larger than the sum of its proper divisors (1).

87813749 is an equidigital number, since it uses as much as digits as its factorization.

87813749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 87813749 is about 9370.8990497177. The cubic root of 87813749 is about 444.4819945612.

The spelling of 87813749 in words is "eighty-seven million, eight hundred thirteen thousand, seven hundred forty-nine".