1521257134 has 4 divisors (see below), whose sum is σ = 2281885704. Its totient is φ = 760628566.

The previous prime is 1521257113. The next prime is 1521257137. The reversal of 1521257134 is 4317521251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4317521251 = 22787 ⋅189473.

It is a junction number, because it is equal to n+sod(n) for n = 1521257096 and 1521257105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521257137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380314282 + ... + 380314285.

It is an arithmetic number, because the mean of its divisors is an integer number (570471426).

Almost surely, 2^1521257134 is an apocalyptic number.

1521257134 is a deficient number, since it is larger than the sum of its proper divisors (760628570).

1521257134 is an equidigital number, since it uses as much as digits as its factorization.

1521257134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760628569.

The product of its digits is 8400, while the sum is 31.

The square root of 1521257134 is about 39003.2964504284. The cubic root of 1521257134 is about 1150.0963080024.

Adding to 1521257134 its reverse (4317521251), we get a palindrome (5838778385).

The spelling of 1521257134 in words is "one billion, five hundred twenty-one million, two hundred fifty-seven thousand, one hundred thirty-four".