74787121 has 2 divisors, whose sum is σ = 74787122. Its totient is φ = 74787120.

The previous prime is 74787091. The next prime is 74787127. The reversal of 74787121 is 12178747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 32080896 = 6535^2 + 5664^2 .

It is a cyclic number.

It is not a de Polignac number, because 74787121 - 2¹³ = 74778929 is a prime.

It is a super-2 number, since 2×74787121² = 11186226934937282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74787127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37393560 + 37393561.

It is an arithmetic number, because the mean of its divisors is an integer number (37393561).

Almost surely, 2^74787121 is an apocalyptic number.

It is an amenable number.

74787121 is a deficient number, since it is larger than the sum of its proper divisors (1).

74787121 is an equidigital number, since it uses as much as digits as its factorization.

74787121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 37.

The square root of 74787121 is about 8647.9547292987. The cubic root of 74787121 is about 421.3169565457.

The spelling of 74787121 in words is "seventy-four million, seven hundred eighty-seven thousand, one hundred twenty-one".