1974881149 has 2 divisors, whose sum is σ = 1974881150. Its totient is φ = 1974881148.

The previous prime is 1974881137. The next prime is 1974881173. The reversal of 1974881149 is 9411884791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1346376249 + 628504900 = 36693^2 + 25070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974881149 - 2²¹ = 1972783997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1974881096 and 1974881105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974881119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987440574 + 987440575.

It is an arithmetic number, because the mean of its divisors is an integer number (987440575).

Almost surely, 2^1974881149 is an apocalyptic number.

It is an amenable number.

1974881149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974881149 is an equidigital number, since it uses as much as digits as its factorization.

1974881149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 52.

The square root of 1974881149 is about 44439.6348882391. The cubic root of 1974881149 is about 1254.6241842286.

The spelling of 1974881149 in words is "one billion, nine hundred seventy-four million, eight hundred eighty-one thousand, one hundred forty-nine".