1187524721 has 2 divisors, whose sum is σ = 1187524722. Its totient is φ = 1187524720.

The previous prime is 1187524717. The next prime is 1187524733. The reversal of 1187524721 is 1274257811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878292496 + 309232225 = 29636^2 + 17585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187524721 - 2² = 1187524717 is a prime.

It is a super-2 number, since 2×1187524721² = 2820429925972255682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1187524711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593762360 + 593762361.

It is an arithmetic number, because the mean of its divisors is an integer number (593762361).

Almost surely, 2^1187524721 is an apocalyptic number.

It is an amenable number.

1187524721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187524721 is an equidigital number, since it uses as much as digits as its factorization.

1187524721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 38.

The square root of 1187524721 is about 34460.4805683264. The cubic root of 1187524721 is about 1058.9632443492.

The spelling of 1187524721 in words is "one billion, one hundred eighty-seven million, five hundred twenty-four thousand, seven hundred twenty-one".