1257121498 has 4 divisors (see below), whose sum is σ = 1885682250. Its totient is φ = 628560748.

The previous prime is 1257121409. The next prime is 1257121499. The reversal of 1257121498 is 8941217521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8941217521 = 65927 ⋅135623.

It can be written as a sum of positive squares in only one way, i.e., 1058396089 + 198725409 = 32533^2 + 14097^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1257121498.

It is not an unprimeable number, because it can be changed into a prime (1257121499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314280373 + ... + 314280376.

Almost surely, 2^1257121498 is an apocalyptic number.

1257121498 is a deficient number, since it is larger than the sum of its proper divisors (628560752).

1257121498 is an equidigital number, since it uses as much as digits as its factorization.

1257121498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628560751.

The product of its digits is 40320, while the sum is 40.

The square root of 1257121498 is about 35455.9092113007. The cubic root of 1257121498 is about 1079.2591793110.

The spelling of 1257121498 in words is "one billion, two hundred fifty-seven million, one hundred twenty-one thousand, four hundred ninety-eight".