1949874257 has 2 divisors, whose sum is σ = 1949874258. Its totient is φ = 1949874256.

The previous prime is 1949874229. The next prime is 1949874271. The reversal of 1949874257 is 7524789491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097000641 + 852873616 = 33121^2 + 29204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949874257 - 2¹² = 1949870161 is a prime.

It is a super-2 number, since 2×1949874257² = 7604019236222604098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1949873257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974937128 + 974937129.

It is an arithmetic number, because the mean of its divisors is an integer number (974937129).

Almost surely, 2^1949874257 is an apocalyptic number.

It is an amenable number.

1949874257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949874257 is an equidigital number, since it uses as much as digits as its factorization.

1949874257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 56.

The square root of 1949874257 is about 44157.3805495752. The cubic root of 1949874257 is about 1249.3061230591.

The spelling of 1949874257 in words is "one billion, nine hundred forty-nine million, eight hundred seventy-four thousand, two hundred fifty-seven".