1531367421 has 16 divisors (see below), whose sum is σ = 2069628288. Its totient is φ = 1007078400.

The previous prime is 1531367399. The next prime is 1531367437. The reversal of 1531367421 is 1247631351.

It is not a de Polignac number, because 1531367421 - 2¹⁷ = 1531236349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531367221) 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, 82041 + ... + 98961.

It is an arithmetic number, because the mean of its divisors is an integer number (129351768).

Almost surely, 2^1531367421 is an apocalyptic number.

It is an amenable number.

1531367421 is a deficient number, since it is larger than the sum of its proper divisors (538260867).

1531367421 is a wasteful number, since it uses less digits than its factorization.

1531367421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17332.

The product of its digits is 15120, while the sum is 33.

The square root of 1531367421 is about 39132.6899279873. The cubic root of 1531367421 is about 1152.6385341413.

Adding to 1531367421 its reverse (1247631351), we get a palindrome (2778998772).

The spelling of 1531367421 in words is "one billion, five hundred thirty-one million, three hundred sixty-seven thousand, four hundred twenty-one".