1531278461 has 16 divisors (see below), whose sum is σ = 1581547968. Its totient is φ = 1481760000.

The previous prime is 1531278431. The next prime is 1531278493. The reversal of 1531278461 is 1648721351.

It is a cyclic number.

It is not a de Polignac number, because 1531278461 - 2¹⁸ = 1531016317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531278421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3637031 + ... + 3637451.

It is an arithmetic number, because the mean of its divisors is an integer number (98846748).

Almost surely, 2^1531278461 is an apocalyptic number.

It is an amenable number.

1531278461 is a deficient number, since it is larger than the sum of its proper divisors (50269507).

1531278461 is a wasteful number, since it uses less digits than its factorization.

1531278461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

The product of its digits is 40320, while the sum is 38.

The square root of 1531278461 is about 39131.5532658748. The cubic root of 1531278461 is about 1152.6162140657.

The spelling of 1531278461 in words is "one billion, five hundred thirty-one million, two hundred seventy-eight thousand, four hundred sixty-one".