1201531 has 2 divisors, whose sum is σ = 1201532. Its totient is φ = 1201530.

The previous prime is 1201523. The next prime is 1201553. The reversal of 1201531 is 1351021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201531 - 2³ = 1201523 is a prime.

It is a super-2 number, since 2×1201531² = 2887353487922, which contains 22 as substring.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1211531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600765 + 600766.

It is an arithmetic number, because the mean of its divisors is an integer number (600766).

2^1201531 is an apocalyptic number.

1201531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201531 is an equidigital number, since it uses as much as digits as its factorization.

1201531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1201531 is about 1096.1436949597. The cubic root of 1201531 is about 106.3110302200.

Adding to 1201531 its reverse (1351021), we get a palindrome (2552552).

The spelling of 1201531 in words is "one million, two hundred one thousand, five hundred thirty-one".