1181421490 has 16 divisors (see below), whose sum is σ = 2127003480. Its totient is φ = 472469760.

The previous prime is 1181421481. The next prime is 1181421497. The reversal of 1181421490 is 941241811.

It can be written as a sum of positive squares in 4 ways, for example, as 1137105841 + 44315649 = 33721^2 + 6657^2 .

It is not an unprimeable number, because it can be changed into a prime (1181421497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55696 + ... + 73924.

Almost surely, 2^1181421490 is an apocalyptic number.

1181421490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1181421490 is a deficient number, since it is larger than the sum of its proper divisors (945581990).

1181421490 is a wasteful number, since it uses less digits than its factorization.

1181421490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24717.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1181421490 is about 34371.8124340280. The cubic root of 1181421490 is about 1057.1459625200.

The spelling of 1181421490 in words is "one billion, one hundred eighty-one million, four hundred twenty-one thousand, four hundred ninety".